Forex tax records navigator — from broker statements to a documented return

Seven steps, an interactive document checklist and a conversion ledger help you prepare your Forex records. Start with your tax residence, instrument, reporting period and tax category: there is no worldwide Forex tax rate or universal return. The international workflow organises records after you establish the applicable rules. A separate, fully worked Poland 2025 case covers a Polish tax resident's private CFD trading under Article 30b of the Polish Personal Income Tax Act, including PIT-38, NBP exchange rates and an auxiliary 19% calculation. Business trading, prop-firm payments, actual currency exchange and other instruments require their own classification. This is educational material, not individual tax advice.

Checked: 18 September 2026. The international ledger accepts your chosen reporting period; it does not maintain a database of tax laws. The Polish example specifically concerns tax year 2025, whose ordinary filing deadline was 30 April 2026. It can support a review or correction of that return. Do not transfer its forms, dates or loss years automatically to 2026 or another jurisdiction.

Start: which case is yours?

First confirm your tax residence, the legal nature of the instrument and the character of the income. Citizenship, your broker's address and your account currency do not, by themselves, establish tax residence. A move between countries or possible dual residence may require examination of the relevant treaty. The three routes below describe how to gather data after you establish the correct reporting framework. See tax reporting across jurisdictions and the exceptions in the FAQ.

Seven steps from statements to filing

1. Confirm the case and reporting period. Write down your residence, instrument, private or business status, tax category, reporting currency and source of the rules for that year. A broker's statement determines how you collect some figures, not whether a tax obligation exists. Do not assume every tax year ends on 31 December: the UK 2025/26 Self Assessment year runs from 6 April 2025 to 5 April 2026, as shown in HMRC's guidance. If different categories require different treatment, use separate datasets.
2. Download full reports from every account. In MT4, look for Account History, select the period and use “Save as Detailed Report”; in MT5, use History and a report for the relevant period. Menu names vary by platform version, so check your broker's documentation. You need closures, partial settlements, commissions, swaps and other ledger postings, with currencies, timestamps and transaction identifiers. Record the server time zone and how you determine the relevant local tax date. Review transactions around midnight and the tax-year boundary particularly carefully. A time zone such as Europe/Warsaw uses CET or CEST depending on the date. Include earlier documents for costs associated with positions opened before the reporting period.
3. Identify the events recognised in this period. Under the Polish private-CFD case, income from derivative rights arises on realisation, usually closure or partial settlement, rather than withdrawal to your bank. An open position's unrealised valuation is not its realised closing result. That is not a universal rule: the US generally applies year-end mark-to-market treatment to qualifying Section 1256 contracts, subject to the definitions and exceptions in IRS Publication 550. Do not assume every retail FX contract qualifies. Review commissions and swaps separately: the date a cost is incurred for currency conversion and the year in which it becomes deductible can differ. The contract and actual cash-settlement terms matter.
4. Convert positive amounts and costs under the applicable rules. Record the source currency, reporting currency, relevant dates, source and exchange rate per one unit of the source currency. Divide a quote per 100 units by 100 first. If an amount is already in the reporting currency, enter a rate of 1. Do not substitute today's rate when the required historical rate is missing. The ledger does not fetch rates. Poland uses the preceding-business-day NBP rule described below. For comparison, HMRC's guidance for foreign-currency assets under capital gains rules converts acquisition and disposal amounts separately at their relevant dates and expects a reasonable, consistent rate source; it does not simply convert a foreign-currency net gain at disposal. That example does not determine the treatment of every Forex contract. Keep a copy of your jurisdiction's relevant guidance and the method actually used.
5. Aggregate compatible income and cost categories separately. Reconcile the signed amounts without using the contract's notional value as a realised CFD result. In the Polish case, positive cash-settled CFD results enter income and negative settled results enter costs. Review separately charged commissions and positive or negative swaps. A fee already shown as negative must not be subtracted a second time, which would turn it into a gain. Nor may a fee included in a net figure be deducted again. A net balance does not replace separate return fields. In the Polish example, +100 USD of realised result and a separately reported −5 USD fee, both converted at 4 PLN/USD, produce PLN 400 income and PLN 20 costs, not PLN 380 income. Group entries only when category and applicable conversion treatment match, retaining the underlying transactions.
6. Prepare the return and any required schedules. Use the right form and instructions for the jurisdiction and year. Establish separately whether foreign income, foreign tax paid, financial accounts or another category has additional reporting requirements. Determine whether a credit or deduction is allowed and how it is limited. The general ledger does not calculate foreign tax credits, loss relief, tax bands or tax payable. The Polish case below gives the specific PIT-38(18) fields and PIT/ZG conditions; the mere existence of a foreign broker does not settle those questions.
7. Review, submit, pay and archive. Check any pre-filled proposal against your complete records. Confirm that the return was actually submitted, save its acknowledgement and retain evidence of payment. Filing and payment deadlines, automatic acceptance and correction procedures depend on the jurisdiction. A saved draft is not proof of submission. If a deadline has passed, first determine whether a return exists and whether you need a late return or a correction, then establish any outstanding tax and interest. The Polish example explains both the ordinary 30 April 2026 deadline and the limited payment procedure for automatically accepted returns.

Keep the classification and conversion method in your archive, not just the final figure. A country's use of a familiar word such as “Forex” does not settle the tax category. For example, the Australian Taxation Office's CFD ruling considers ordinary-income treatment for business or commercial profit-making activity and the associated conditions for deductions. It is not a rule that every private trader worldwide reports a capital gain. When the facts do not fit the method you have established, separate the event for review rather than forcing it into the ledger.

Interactive document checklist

The checklist and ledger use this browser's local storage when available. No account is required. If storage is blocked, a message explains that you should export or print before closing the page. The tool's script does not transmit your entries or call an exchange-rate API. The wider website may use advertising and analytics services; do not enter tax identification numbers, login credentials or account numbers here. “Print checklist” prepares an archive copy. The counter measures checked boxes, not the correctness or completeness of a tax return.

Conversion ledger and Polish calculation

Enter separate positive amounts (+) and costs (−) already classified for your selected period and category. These may include settled CFD results, separately charged commissions or swaps, depending on the applicable rules. Do not paste a whole account's or day's net result in place of separate components. The international mode is a supporting records ledger: it does not determine taxable income, deductibility or tax payable. Keep incompatible tax categories in separate datasets and export before clearing the ledger for another one.

Set the jurisdiction, period, category, reporting currency and conversion/recognition method first. In each row, “Date recognised in this period” identifies when the amount belongs in the selected period. “Event / cost-incurrence date” records the underlying event used for the conversion analysis. These can differ for a deferred cost. In the Poland 2025 mode, positive income must have an event date in 2025; an earlier cost date is permitted only after you confirm that the cost is deductible in 2025. Preserve evidence of that conclusion. For a foreign-currency row, record the rate date and source; for an amount already in the reporting currency, use rate 1 and leave those rate-reference fields blank. The tool validates format and completeness, not the tax classification or accuracy of the chosen rate.

Products are calculated exactly from the entered decimal numbers; positive and negative products are totalled separately before the totals are rounded to your chosen number of decimal places. Individual row displays are rounded too, so adding their displayed values can differ from rounding the full-precision total. The selected precision is a records setting, not a declaration of the legally required rounding method. CSV preserves the original inputs and exact products. In Poland 2025 mode, category totals use two decimal places; the tax base and final 19% result are rounded to full PLN, with fractions below 0.50 rounded down and fractions of 0.50 or more rounded up.

The Polish calculation applies only to the entered set and the manually established loss allowance. It excludes the foreign tax credit, solidarity levy, interest and other parts of PIT-38. If you enter only one of several accounts, its result is not the tax due on your complete return. International mode never applies the Polish rate or Polish loss deduction.

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Costs: what to classify and check

The entries below preserve the distinctions needed for the Polish example. For another jurisdiction, use them as questions to investigate, not as a universal list of deductible expenses. The sign of a broker posting alone does not establish its tax treatment.

Poland 2025: the PIT-38 procedure

This section is jurisdiction-specific. It concerns a Polish tax resident's private cash-settled CFD trading taxable under Article 30b for 2025. It is the Polish worked case within the international navigator, not a filing route for residents of other countries. Residence is not established solely by citizenship or account currency; examine the applicable treaty where necessary. The statutory basis, annual form instructions and official guidance are listed in sources.

Reports, realisation and separate cost dates

A broker operating in Poland may issue PIT-8C, whereas a foreign broker commonly does not. Verify what your actual broker provides. For 2025, the deadline for delivering PIT-8C to the taxpayer was 2 March 2026: the end of February fell on a Saturday. Reconcile the information with the source report, clarify discrepancies with the issuer, and never include the same history twice by adding both PIT-8C figures and reconstructed ledger figures.

Income from CFD rights arises when those rights are realised, usually on closure or partial settlement. Your own deposits and withdrawals do not replace this event record. An unrealised valuation of a position still open on 31 December is not the result of closing that position. Commissions and swaps require separate examination. The cost-incurrence date used for currency conversion and the year of deduction are different questions. Article 23(1)(38a) governs the deferred recognition of expenditure associated with acquiring a derivative; do not assume every daily charge or payment has identical treatment. Establish from the contract whether a posting represents an independent cash settlement, and retain evidence for expenses incurred before the year in which they become deductible.

The NBP conversion rule

Article 11a(1)–(2) requires the average NBP exchange rate from the last business day preceding receipt of income or incurrence of the cost, respectively. Convert the components separately. For USD or EUR, use the NBP Table A archive. A Monday event normally refers back to Friday, but a Friday public holiday may require an earlier business day. Record the table's date and number as well as the rate per one unit. If the published quote is per 100 units, divide by 100 first. For a currency outside Table A, establish the appropriate average-rate table and date.

An amount already denominated in PLN needs no second conversion: enter PLN and rate 1, leaving table fields blank. A missing rate or unavailable archive stops the calculation until the correct value is established; today's quote is not a replacement. The tool checks that a foreign-currency rate date precedes the event and is not a weekend. It does not check holidays, identify the last eligible business day or verify the quoted NBP value. Those checks remain part of your records preparation.

Return fields and foreign income

In PIT-38(18) for 2025, PIT-8C amounts belong in section C, row 1, fields 20 and 21. Income and costs not reported in PIT-8C belong in row 2, fields 22 and 23. Eligible deductions for prior losses from 2020–2024 go in field 30. The ledger's totals are supporting figures: reconcile all accounts and the correct categories before using them in the return. Loss relief is explained in the separate section below.

A foreign broker's address does not automatically require PIT/ZG. The Ministry of Finance brochure relates the schedule to foreign income taxable in Poland under the foreign-tax-credit method in Article 30b(5a)–(5b). Prepare a separate schedule for each relevant country in which income was obtained. The absence of foreign tax paid does not, by itself, settle whether the schedule is required. Establish the income's nature, the appropriate country and the applicable treaty; if the contract is unclear, consult Poland's National Tax Information service (KIS) or an adviser. A credit for qualifying foreign tax actually paid is subject to a proportional limit, which this calculator does not compute.

Twój e-PIT, filing and payment

The filing window for 2025 was 15 February–30 April 2026. Review the prepared PIT-38 against all your accounts. A return prepared using PIT-8C information may be automatically accepted if it has not been rejected or replaced by a return you submit. Other income or costs require you to add the missing figures and send the return. Merely saving edits is not submission. If no PIT-38 has been prepared for you, do not assume that one will create itself.

The ordinary payment deadline was 30 April 2026, using your own Polish tax micro-account. A specific procedure applies to tax shown by an automatically accepted return: the tax office sends information about the amount, and payment is due within seven days of receipt. That is not a general deferral for tax on omitted transactions. If you review 2025 after the deadline, determine whether a late return or a correction is needed, then establish any outstanding tax and interest. Keep the UPO, the official submission acknowledgement, and confirmation of payment. See the Ministry's guidance on automatic acceptance and unsent edits.

Worked example: a USD account and three transactions

Illustrative assumptions — Poland 2025 only: three cash-settled CFD realisations, with no additional commissions or swaps included in these amounts, no other accounts, no prior loss deduction and no foreign tax credit. The figures are the realised results of the instruments, not balances after separately charged fees; positive and negative components remain separate. The calendar dates are real, but the rates 3.9000 / 3.8500 / 3.8200 are invented for the arithmetic, not actual NBP quotations.

Income: 1,638.00 + 364.81 = PLN 2,002.81. Costs: PLN 693.00. Net income: PLN 1,309.81 → rounded tax base PLN 1,310 → 19% = PLN 248.90 → PLN 249 payable to the tax micro-account under these assumptions. Notice the date mechanics: Monday's closure uses Friday's rate, and each event has its own rate. The calculator multiplies by the rate you select and enter; it does not select Friday or verify the quote against NBP. Never use these fictional rates in an actual return. Retrieve the correct values and table numbers from the archive. A separately charged commission needs an additional cost entry with its own date and rate, rather than a reduced realisation result.

Loss relief and carryforwards

For your jurisdiction, establish whether an offset is permitted, which category it belongs to, whether a claim or election is needed, how much can be used, and when unused relief expires. Do not combine employment income, business results, dividends, crypto and derivative results merely because one broker or one return reports them. The international ledger calculates a records balance only: a negative balance does not establish a legally deductible or carryforward loss.

The following rules belong specifically to the Polish private-CFD case for 2025. They are retained here so the worked example includes the complete loss-records procedure, rather than just a 19% multiplication.

• Within 2025: combine the appropriate income and costs covered by Article 30b(1), such as private CFDs and disposals of shares or ETFs. One form does not create a single basket for everything: dividends, interest and cryptocurrency have separate rules. Income from redemption or repurchase of capital-fund units entered this reporting framework from 2024; do not apply that change retrospectively to earlier years.
• Across years: for PIT-38 for 2025, examine unused losses from 2020–2024 and the appropriate source. For fund losses covered by the change from 2024, the relevant prior year here is 2024. Each loss has its own five successive years for deduction and its own record of amounts already used.
• Two methods for a given loss: deduct up to 50% of the original amount in each year of the window, or deduct up to PLN 5,000,000 once in a chosen year, with the remainder used in the other years of the window subject to a 50%-of-original-loss annual limit. The unused loss balance and current income also limit relief. The PLN 5 million figure limits the deduction in the chosen year; it is not a condition that the entire original loss must be below PLN 5 million.
• Separate limit example: a 2022 loss was PLN 40,000, PLN 10,000 has already been deducted, and 2025 income is PLN 12,000. Under the 50% method, the annual ceiling is PLN 20,000, but no more than PLN 12,000 can be used in 2025. PLN 18,000 remains within the window ending in 2027. The calculator does not know this history: enter only the eligible amount you have established.
• Failure to file does not mathematically erase a loss. A loss arises from costs exceeding income and needs to be reported in PIT-38 for the appropriate year, including through a late return or correction where available, subject to time limits and procedural restrictions. Delay may have evidential or fiscal-penal consequences; it must not be described as an automatic, irreversible loss of every right to relief. See loss carryforwards for the wider records context, checking its jurisdiction and year before applying a rule.
• No offset against employment, business income, dividends or crypto. A private-CFD loss does not reduce those separate Polish tax calculations. Keeping the items on one account or reporting them in the same return does not change the category rules.

For every loss year, retain the original amount, deductions claimed in earlier returns, unused balance, chosen method and end of the five-year window. The relevant Polish sources are Article 9(2)–(3) and (6) of the Personal Income Tax Act and the notes to section D in the 2025 Ministry of Finance brochure. Do not enter an estimate of a loss you have not yet reconciled as an available deduction.

Related course material

• 14.2 Tax reporting across jurisdictions — broker information versus your own reporting obligations; background to the navigator's first step.
• 14.3 Record keeping step by step — the longer records workflow, including statements and tools.
• 14.4 Loss carryforwards — the records and arithmetic behind offsets and unused losses; always check the applicable jurisdiction.
• 14.6 Trader tax myths — expense classification, residence and the mistaken assumption that leaving profits with a broker prevents taxation.
• Toolkit H — AI workshop — P5 helps analyse journal metrics locally, but does not calculate tax or NBP conversions. A journal in R is not a tax ledger.
• Toolkit J — trader checklists — maintain records throughout the year so reporting season does not begin with reconstructing months of activity.