Closing the Books: The Checklist for a Stress-Free Corporate Tax Return

The same moment rolls around every year: the books need to be closed before filing the Corporate Tax return, and last-minute rushing tends to leave loose ends that end up costing dearly, quite literally. A proper year-end close is not a mechanical four-entry formality — it’s the guarantee that the result reported to the tax authorities is the real one, and that it will hold up if an audit ever comes knocking. This guide walks through, in the order it should be done, the points that simply cannot be skipped before calling a fiscal year closed.

Preliminary reconciliations: the foundation for everything else

Before even thinking about adjustments or depreciation, you need to check that the books “add up” in the most literal sense: that each account balance matches the reality it’s supposed to represent. At a minimum, this means verifying that input and output VAT recorded during the year matches what was reported in the quarterly VAT returns (Form 303) and the annual summary (Form 390); that withholdings deducted and paid over (Forms 111, 115) tie out with what’s recorded in supplier, creditor, or payroll accounts; and that customer and supplier balances are backed by real invoices, with no amounts “floating” from prior years that nobody has ever reviewed. If a discrepancy shows up at this stage, however small, this is the moment to investigate it, not to carry it forward into the close: a few-hundred-euro mismatch in a quarter’s VAT almost never resolves itself — it’s usually an invoice that was recorded incorrectly, duplicated, or simply missed.

It’s also worth reviewing suspense and provisional accounts (customer advances, shareholder accounts, unclassified income and expenses) so they don’t carry over “unresolved” into the close. Every account left unexplained on the closing balance sheet is a question someone will eventually ask.

Depreciation and accruals: making sure the result is the right one

The second block is purely about accrual accounting. Depreciation on tangible and intangible fixed assets must be charged for the correct amount according to each asset’s useful life and depreciation method, and must match what’s reflected in the asset register and the accumulated depreciation account. It’s common to find assets added during the year that were never depreciated, or depreciation calculated on a base that was never updated after an improvement or a partial disposal. It’s also worth checking whether any asset has suffered a lasting loss of value that might call for an impairment charge — something different from ordinary depreciation.

Alongside depreciation come accruals: expenses and income that, because they were recorded on a cash basis or because the invoice arrived in a period different from the one it actually covers, need to be spread across fiscal years. The classic example is an annual insurance policy paid in the autumn that also covers the first few months of the following year, or rent collected in advance. If these aren’t accrued properly, the year’s result gets distorted — and with it, the Corporate Tax taxable base. It’s also worth checking whether provisions are needed, such as for possible customer insolvencies, whenever there are reasonable grounds to expect non-payment.

Bank reconciliation and the right order: close the books first, then file the return

No year-end close is reliable unless the book balance of each bank account matches the actual statement at year-end, adjusted for items in transit (checks issued but not yet cashed, transfers still in process). Year-end bank reconciliations should be documented in writing, account by account, because it’s the first thing any review will check, and because it tends to expose duplicate entries or payments recorded twice.

Once reconciliations, depreciation, accruals, and bank accounts have all been reviewed, the logical order is: close the year’s books with the regularization and closing entries, calculate the Corporate Tax liability (Form 200) on those final balances, and only then open the following year carrying forward the correct balances. Reversing this order — calculating Form 200 on books that are still provisional and then trying to “fit” the adjustments in afterward — is the most direct route to discrepancies between what’s filed and what’s recorded, and those are expensive to untangle later.

At Zythos Business we guide sole traders and small businesses through this closing process with the same principle: review before calculating, and calculate before filing. If you’d like to close your fiscal year with the confidence that every figure on your Corporate Tax return is backed by books that truly add up, we’re here to help.