Last reviewed October 7, 2026 · By the NYBACS advisory team
Short answer
Monthly is the standard for most operating US companies: reconcile every account, record accruals and lock the period within a few weeks of month-end. Very early or low-activity companies can close quarterly, but a company with payroll, investors, a lender, sales tax filings, a foreign parent's group reporting or an upcoming audit generally needs a monthly close to produce numbers people can rely on.
Key takeaways
- A close is not finished until every bank, card and processor account is reconciled to its statement and the period is locked against edits.
- Quarterly closes can work for a pre-revenue company with few transactions, but payroll, sales tax and estimated tax deadlines often force a tighter rhythm.
- A calendar-year C-Corp generally pays estimated federal income tax in four installments, due on the 15th day of the 4th, 6th, 9th and 12th months of its tax year.
- A foreign parent's group reporting deadline usually sets the US subsidiary's close date, not the other way round.
- The year-end close adds steps the monthly close skips, including contractor information returns, fixed-asset review and tax schedules.
Monthly, quarterly or annual: how to choose
| Company profile | Suggested cadence | Why |
|---|---|---|
| Pre-revenue, a few dozen transactions a month, no payroll | Quarterly, with monthly bank reconciliation | Low volume, but reconciling monthly prevents surprises |
| Revenue-generating, payroll or contractors | Monthly | Payroll, sales tax and management decisions need current numbers |
| Investor-backed or borrowing | Monthly, within a set deadline | Board packs, investor updates and covenant tests depend on it |
| US subsidiary of a foreign group | Monthly, aligned to the parent's timetable | Group consolidation cannot wait for the US entity |
| Preparing for an audit | Monthly, with documented reconciliations | Auditors test year-end balances built from monthly work |
An annual-only close — doing the books once at tax time — is rarely a good idea for any company with real activity. Errors compound for twelve months and the documents needed to fix them are harder to find.
What a month-end close includes
A close is a checklist, not just categorizing the bank feed:
- Confirm all transactions for the month are recorded, including card and processor activity.
- Reconcile every bank, fintech, card, loan and processor clearing account to its statement.
- Record accruals for expenses incurred but not yet billed, such as contractor work or cloud usage.
- Release deferred revenue earned in the month and record prepaid expenses used up.
- Agree intercompany balances with the parent or affiliates.
- Review the profit and loss and balance sheet for unusual movements and fix miscodings.
- Lock the period in the accounting software so later edits require a deliberate reopening.
- Produce the monthly reports.
For most small companies this can be completed within two to three weeks of month-end once the process is established.
Deadlines that set the close calendar
The right cadence is often dictated by obligations outside the books:
- Sales tax returns are filed monthly, quarterly or annually depending on the frequency each state assigns, and need accurate taxable sales.
- Payroll filings such as the quarterly Form 941 must agree with wages in the ledger.
- Estimated federal tax for a profitable C-Corp is due in quarterly installments, and a reliable year-to-date profit figure makes the calculation possible.
- Parent reporting packs for a foreign group often fall due within days of month-end.
- Lender covenants and board meetings come with their own reporting dates.
Work backwards from the earliest of these to fix the close deadline.
The year-end close: the extra layer
The final close of the year is heavier. In addition to the monthly steps, it typically covers:
- Preparing data for Form 1099-NEC for US contractors, generally due January 31, and for Form 1042-S for certain payments to foreign persons, generally due March 15.
- Reviewing fixed assets, disposals and depreciation.
- Checking cut-off so revenue and expenses land in the correct year.
- Rolling forward equity and confirming owner or shareholder transactions.
- Building schedules the tax preparer needs, including related-party totals for Form 5472 where it applies.
Starting the year-end close in January rather than March leaves room for extension decisions if something is unresolved.
Signs the close is too slow or too loose
- Monthly reports arrive after decisions have already been made.
- Prior months keep being reopened to post late entries.
- Reconciliations carry differences that are explained as timing for months.
- The parent company or investors are sent preliminary numbers that later change materially.
Any of these suggests the process needs a defined checklist, an owner and a deadline.
The fix is usually structural rather than a matter of working harder. Collect statements automatically or on a fixed day, send open questions to the business in one batch, and set a materiality threshold so small items do not hold up the whole close. Agree in advance which accruals can be estimated — for example, cloud usage based on the provider's dashboard — and true them up when the invoice arrives. Finally, give the close a single owner who signs off that every step on the checklist is complete; without that, monthly closes tend to slide into quarterly ones without anyone deciding they should.
Common mistakes to avoid
- Treating a categorized bank feed as a closed month without reconciling balances.
- Leaving periods unlocked so later edits quietly change numbers already reported.
- Skipping accruals, so a large annual software bill or contractor invoice distorts a single month.
- Closing the US books after the parent's consolidation deadline, forcing the group to use estimates.
- Leaving the year-end close until the tax filing deadline is close.
- Reconciling the operating account but not processor clearing or card accounts.
NYBACS 360° support
How NYBACS helps
- Sets a close calendar aligned to your sales tax, payroll and parent reporting deadlines.
- Performs monthly reconciliations, accruals and deferred revenue entries, then locks the period.
- Runs a documented close checklist with review sign-off.
- Provides year-to-date figures your tax preparer can use for quarterly estimated tax calculations.
- Prepares year-end contractor and foreign-payee data and tax schedules for coordination with tax professionals.
Frequently Asked Questions
How long should a monthly close take?
For a small company with organized records, a close can usually be completed within two to three weeks of month-end, and often faster once routines settle. Delays usually come from missing statements or unanswered questions, not the accounting itself.
Can we close quarterly if revenue is small?
Often yes, provided bank accounts are still reconciled monthly and no outside deadline needs monthly numbers. Move to monthly once there is payroll, investors or a parent reporting requirement.
What does locking a period mean?
It sets a closing date in the accounting software so transactions in that period cannot be added or changed without deliberately unlocking it. This protects reported figures from accidental edits.
Do cash-basis companies need a month-end close?
Yes. Cash-basis books still need reconciliations, correct categorization and a locked period. The accrual steps are lighter, but the controls are the same.
Our parent's fiscal year runs April to March. How do we close?
Close the US books monthly. Monthly periods can then be grouped into the US tax year and into the parent's April–March reporting year without redoing work.
