A company can change its accounting firm at any point in the financial year. The risk does not come from the calendar date itself, but from an unclear division of work, incomplete records, unreconciled balances or access that remains with the former provider. A controlled transition should preserve one continuous accounting record and one accountable timetable for every filing, payment and payroll run.
1. When is the right time to change accounting firm?
There is no general rule requiring a switch on 1 January or after the annual financial statements are filed. A month-end, quarter-end or year-end can simplify reconciliation, but a mid-month transition is also possible if the responsibilities are split precisely. Do not postpone a necessary change merely to reach year-end when deadlines, access or data quality are already at risk.
Choose a date that gives the new firm enough time to review the chart of accounts, tax status, payroll calendar, open audits and reporting obligations. Avoid a cut-off immediately before a VAT/JPK, payroll, CIT, KSeF or annual-reporting deadline unless both firms agree a written overlap plan.
2. Management remains responsible after outsourcing
Polish law permits an entity to entrust its accounting books to a qualified service provider, but the head of the entity remains responsible for accounting duties and supervision. For a Polish company this normally means the management board. A contract with an accounting firm allocates operational tasks and liability between the parties; it does not transfer the company's statutory accountability to tax authorities, courts or owners.
When selecting the replacement provider, verify scope, staffing, business continuity, data security and mandatory professional indemnity insurance for outsourced bookkeeping. A historical Ministry of Finance accounting certificate is not a universal licensing requirement after deregulation, so current competence and controls must be assessed directly.
3. Fix the cut-off date and divide every responsibility
| Workstream | Former firm | New firm | Evidence |
|---|---|---|---|
| Bookkeeping | Post documents through the agreed date and lock the final period | Continue from accepted balances and open items | Trial balance, journal, ledgers, handover protocol |
| VAT/JPK | Prepare the period expressly allocated in the schedule | Review continuity and file the first assigned period | Filed XML/JPK, UPO, reconciliation |
| CIT/PIT | Calculate and document the last assigned advance or return | Continue tax computations and tax-loss schedules | Calculation files, return, UPO |
| Payroll/ZUS | Close the agreed payroll, declarations and employee changes | Import employee data and run the first assigned payroll | Payroll register, ZUS files, confirmations |
| Annual close | Either complete it or hand over a documented closing package | Review and complete only if expressly agreed | Closing checklist, financial statements, KRS evidence |
| Corrections and audits | Define responsibility for historic periods | Define review, representation and additional fees | Named owner and response deadline |
The schedule must name the owner of corrections relating to periods handled by the former firm. Without this point, both providers may assume that the other will respond to a tax notice or correct a historical JPK file. The company should remain the decision-maker and keep a single deadline register.
4. Review and terminate the existing contract correctly
Check the notice period, permitted delivery method, outstanding fees, post-termination support, data-export rules, document return, confidentiality, processor obligations and the procedure for unresolved work. Give notice in the contractual form and retain proof of delivery. The service end date and the accounting cut-off date may differ, so state both.
Do not make access revocation the first step. First secure copies of filings, UPO confirmations, reconciliations, payroll outputs and data exports. At the same time, do not leave the former provider with open-ended access: the protocol should specify which access remains temporarily active, for what purpose and until what exact date.
5. What records should the former accounting firm hand over?
| Area | Minimum handover package |
|---|---|
| Accounting | Accounting policy, chart of accounts, opening balances, journal, general and subsidiary ledgers, monthly trial balances, source-document index, year-end and audit adjustments |
| Receivables/payables | Open-item lists, ageing, advances, deposits, disputed balances, confirmations and collection status |
| Tax | VAT registers, JPK files and UPO, CIT/PIT calculations, tax-loss and deferred-tax schedules where relevant, withholding-tax files, correspondence and open proceedings |
| Assets/inventory | Fixed-asset and intangible-asset registers, depreciation, leases, inventory counts and warehouse reconciliations |
| Payroll/HR | Employee master data, contracts and changes, payroll registers, leave and benefit balances, PIT and ZUS submissions, PPK data where applicable |
| Corporate reporting | Signed financial statements, approvals, KRS/RDF filings, management reports, audit files supplied by the company |
| Systems | Native export where agreed, readable reports, CSV/XLS/XML/JPK files, document archive, integration map and access inventory |
6. Reconcile the books before importing balances
The new firm should not accept a single opening-balance spreadsheet without supporting reconciliations. At minimum, match the trial balance to the general ledger, bank and cash balances, receivables and payables, VAT registers and JPK submissions, CIT/PIT calculations, payroll liabilities, fixed assets, equity and prior-year closing balances. Record every unexplained difference as an open item with an owner and deadline.
Changing software does not create a new accounting year and does not erase prior errors. The same entity's books must remain continuous, complete, verifiable and current. Preserve the audit trail between the former system, the transfer files and the first period in the new system; keep readable archives even if a native backup cannot be imported.
7. Transfer payroll and employee records separately
Payroll has its own deadline and privacy risks. Agree which provider prepares the last payroll, ZUS declarations, PIT advances, employee onboarding or deregistration, sick-leave processing, PPK files and year-end employee information. The first payroll under the new provider should be test-reconciled before payment files are released.
Transfer only through an approved secure channel and limit access to named staff. Verify employment terms, tax declarations, social-security codes, benefit bases, leave balances, garnishments and bank-account data. A payroll register total alone is not enough to reproduce individual calculations correctly.
8. Update NIP-8, CEIDG and the place of keeping the books
For entities entered in KRS, the address where accounting records are kept is supplemental tax-registration data and is normally updated on NIP-8. The Taxpayer Identification Act generally requires an update within 7 days of a change. The Accounting Act also requires the head of an entity whose books are kept outside its registered office or place of management to notify the tax office of the place of keeping the books within 15 days of releasing them and to ensure access for authorised inspections.
Use the shorter 7-day operational deadline and confirm the correct filing route for the entity. A sole trader normally updates relevant tax and business data through CEIDG. Check whether any correspondence address, establishment, VAT-registration or payer data also changes; changing the accounting firm alone does not automatically change every public register entry.
9. Replace tax, ZUS and KSeF permissions
Map powers of attorney separately. OPL-1 changes or revokes UPL-1 authority to sign electronic tax returns; OPO-1 changes or revokes a general PPO-1 tax power. In ZUS, PEL grants or changes authority and PEL-O revokes it. Confirm new permissions before the first filing, then verify the lists of active representatives in e-Tax Office and eZUS.
KSeF requires a full permission-tree review. The taxpayer must authorise each client context, and removing one administrator does not automatically remove permissions that person previously granted to others. Revoke the former firm's entity and indirect permissions, disable or replace its tokens/certificates where applicable, grant the new firm only the required scopes and perform a test in the correct NIP context.
10. Close data-processing and security access
The accounting engagement usually involves processing employee, contractor and customer personal data. Under Article 28 GDPR, after the service ends the processor must, at the controller's choice, return or delete personal data and delete copies unless Union or Polish law requires retention. The termination protocol should identify returned data, deleted environments, retained statutory copies and their legal basis.
Remove mailboxes, cloud folders, banking roles, accounting-platform accounts, document-scanning applications, KSeF credentials, e-Tax Office and eZUS permissions, and integrations. Change shared passwords rather than merely asking former users not to log in. Keep an access log showing who approved, executed and verified each removal.
11. Common mistakes that cause gaps or duplicate filings
- Ending the contract before securing data exports and UPO confirmations.
- Using different cut-off dates for bookkeeping, VAT, payroll and bank imports without a written matrix.
- Importing balances without reconciling open items and tax returns.
- Assuming the former firm will correct historical periods without an express mandate.
- Granting the new firm access but leaving the former firm's UPL-1, PPO-1, PEL or KSeF permissions active.
- Revoking one KSeF administrator without checking permissions granted downstream.
- Moving payroll data through ordinary email or without a completeness test.
- Treating a change of software as permission to restart or rewrite the accounting record.
- Missing the 7-day tax-registration update or the separate place-of-books notification.
- Accepting a handover described only as “documents sent” without a signed inventory and exceptions list.
12. A 30-day safe-transition checklist
- Appoint the company-side migration owner and create a deadline register.
- Review the current contract, notice rules and outstanding work.
- Select the cut-off and assign every filing, payroll and correction.
- Sign the new scope, data-processing terms and service timetable.
- Inventory systems, bank roles, mailboxes, KSeF, tax and ZUS permissions.
- Request the complete handover package in agreed formats.
- Reconcile the trial balance, taxes, payroll, banks and open items.
- Update NIP-8 or CEIDG and the place-of-books data within the applicable deadline.
- Grant and test new UPL-1/PPO-1, PEL and KSeF permissions as needed.
- Run the first payroll and filing checks before release.
- Sign a handover protocol listing received files and unresolved exceptions.
- Revoke obsolete access, document GDPR return/deletion and monitor the first two reporting cycles.
inPL can coordinate the transition through accounting, transfer payroll processes through payroll and HR, and verify opening balances and control gaps through accounting and tax audit.
Legal, tax and accounting information verified on 20 August 2026. Contractual scope, filing route and deadlines may depend on the entity, accounting method and active proceedings. Confirm the final handover plan for the specific company before implementation.