October 15 tax extension deadline 2026: organise your bank statements

For most individuals who obtained a valid extension for their 2025 federal income tax return, the filing deadline is 15 October 2026. The extension bought time to file, not extra time to pay: the usual payment deadline was in April. Confirm any disaster relief or other exception that applies to you with the IRS's 2026 extension guidance.

The practical task now is to turn your 2025 records into a pack your preparer can review. This article covers the bank-records part, not the full return or a promise that a late handover can be completed by the deadline.

Download the tax-preparer handover checklist (.csv). Confirm your preparer's acceptance and document cutoff before planning the work.

First pass: inventory every account

List every account used for the business in 2025: checking, savings, credit cards, payment processors, closed accounts and any personal account with business transactions. Record which months you have and which are missing.

Download January–December 2025 statements. Adjacent statements may help explain timing differences, but do not automatically include their transactions in 2025 totals. If an account has closed, request older statements immediately and tell the preparer about the gap.

Collect sales invoices, receipts, payroll information and other supporting records alongside the bank files. Income forms and processor reports are useful cross-checks, not substitutes for the complete transaction history.

Second pass: make usable transaction rows

Use the bank's CSV when available. Otherwise convert the PDFs and download CSV or Excel. Keep source filenames and account identifiers in the working file.

Inspect the output before categorising. Check the first and last dates, wrapped descriptions, refunds and page boundaries. A passing balance check verifies the net arithmetic where balances are available; it does not prove every description, account or category is correct.

Convert password-protected files individually so you can supply the password. Keep the original statements in your own records; do not rely on a converter as your archive.

Third pass: separate the decisions

Start with Income, Expense, Transfer, Personal and Review. Add more detailed working expense categories only when the evidence supports them. Your preparer determines tax treatment, including timing, depreciation, limitations and business-use allocations.

A fictional checking-account extract illustrates the distinction:

Transaction	Signed amount	Working treatment
Invoice 101 payment	2,500.00	Income, match invoice
Advertising receipt	-120.00	Expense, retain receipt
Card repayment	-400.00	Transfer, match card
Owner contribution	1,000.00	Financing/owner funds, ask preparer
Equipment purchase	-900.00	Review treatment with preparer

Do not count the card repayment as another expense if the card purchases are already included. Do not treat an owner contribution as a sale because it increased the bank balance.

Fourth pass: reconcile and explain differences

For each account, compare statement movement with the full transaction list. Reconcile to the ledger separately, documenting outstanding items and bank-feed overlaps. Sum category totals only after this check.

Processor deposits may be net of fees, refunds and reserves. Use settlement reports to bridge gross sales to the bank receipts; the payout reconciliation guide explains the method.

Send a handover, not just a folder

Include:

• Account inventory with missing periods explicitly marked.
• Source statements and untouched exports.
• Working transaction spreadsheet and supporting receipts.
• Reconciliation notes and category summaries.
• A short question list, with an owner for each answer.

Use your preparer's secure transfer channel. Ask for confirmation that the pack arrived and agree who will resolve open items. If records remain missing, explain that clearly rather than guessing totals to make the workbook look finished.

Keep the next year separate

This October deadline concerns a 2025 individual return. It is not a universal deadline for every business entity or every state return. Follow the dates applicable to your own filings.

Once the pack is complete, maintain 2026 records monthly using the catch-up bookkeeping workflow. Converting the source PDFs removes the typing; evidence and review are what make the resulting pack useful.