Postlock for finance managers & CFOs

Your board trusts those numbers. Would you know if they'd changed?

You sign off the month-end, send the board pack, and the figures become fact - until someone backdates an entry and they silently aren't any more. Postlock snapshots every balance at sign-off and watches automatically. The moment anything moves, you're told - before the auditor asks why the numbers don't tie.

Check my closed months · free Try it on demo data
Read-only. Postlock connects to Xero read-only - it can never post, edit or delete anything in your ledger.
Board figure · movedNet profit down £650 since you reported it. P. Jennings · correcting journal.
Board figure · tracked
Net profit · March 2026
24,760.00
Changed by −650.00 since you signed off. You reported 25,410.00 to the board. Update the pack, or restore the closed month in Xero.
Re-checked automatically · flagged this morning
The insight

The textbook schedules aren't the pain. The balances nobody can explain are.

Everyone has a spreadsheet for prepayments and accruals. The pain is the one-off deposit from 2022, the duty accrual, the supplier prepayment from eighteen months ago - the balance sheet where every month-end someone asks "what is this £10k again?" and nobody remembers. Every balance-sheet line in Postlock carries a "what this is" note - written once by you, carried forward to every future month, printed in the pack. New starters reconcile balances they've never seen without asking anyone. Your auditor reads the file without needing a guided tour.

Institutional memory
Other debtors · deposit
42,000.00
"Rent deposit on the Leeds unit, paid Mar 2024. Held by Brigham Estates, returned at lease end (Mar 2029). Not a prepayment - don't amortise."
Written Mar 2024 · carried forward every month since
The problem

A Xero lock date is a soft control.

Any Xero admin can lift it. Entries can be backdated. Integrations routinely post historic data. When any of those things happen, your signed-off balance sheet changes - and nobody automatically tells you.

Sign-off day

You've reconciled every line, the board pack is clean, the period is locked. You send the numbers to the board and move on.

A week later

A team member posts a correcting journal against last month. Or AP enters a supplier invoice into the closed period. Or the bank feed syncs a transaction that should have landed in the period you just closed.

The silence

No alert. No notification. The board is working from a pack that no longer reflects the ledger - and nobody told you.

With Postlock

The change is caught, attributed to the person who posted it, and flagged. You deal with it in minutes - not when an auditor asks why the numbers don't agree.

Minutes, not a scrambleFixed before it ever reaches the board.
postlock.co/integrity
March 2026 · signed off 04 Apr 08:55 · compared with live Xero just now
Board figure moved since you reported it Action
You reportedAt sign-offXero nowDifference
Net profit25,410.0024,760.00−650.00
What moved it
TypeRefByAmount
JournalJNL-0044
Accrual correction · March
P. Jennings650.00

Board figure caught - what moved, who moved it, when.

What you get

Built for a defensible sign-off.

Automatic post-lock monitoring

Lock a period and Postlock watches it on a schedule. Any post-close change is caught and attributed (who posted what document, when) and flagged before it surfaces in an audit question or a board conversation.

Board-figure attestation

Declare your headline numbers at sign-off - net profit, net assets, revenue. Postlock re-checks each against Xero every cycle and tells you in plain English if any have moved since you reported them to the board.

Audit-ready Excel pack

One click: a formatted workbook with cover, balance sheet, rec index with all your institutional notes, supporting schedules, and a post-lock change log. The file your auditor asks for - not a screenshot of a dashboard.

Supporting schedules that roll forward

Movement, balance proof, or expected-value schedules. They carry forward each month, tie to the Xero balance in real time, and expired items drop off automatically. Build the schedule once; it maintains itself.

Segregation of duties

Optionally require two people to lock a period. A preparer submits; a reviewer approves. Self-approval blocked. Every lock is recorded - who submitted, who approved, and when.

Read-only · never risks your ledger

Postlock connects read-only to Xero and is technically incapable of posting, editing or deleting anything. When it spots a change, a human fixes it in Xero. Your ledger is never at risk from us.

Year-end

Year-end becomes a download, not a rebuild.

At year-end your accountant asks for the working papers behind every balance. With Postlock, they already exist - built during each monthly close and rolled forward all year. The Excel pack is the working-paper file: schedules, institutional notes, post-lock change log included. You hand over a file, not a weekend's work.

Each month

Close as normal

Reconcile, note, schedule, lock. Postlock carries everything forward to the next month automatically.

Year-end

Download the pack

12 months of reconciliations already in Excel. Notes, schedules, the full post-lock change log - all there, nothing to rebuild.

Hand off

Send the file

Your accountant has everything they need. No rebuilding April from memory in December.

Is this for you?

Postlock for in-house finance, plainly.

This is for you if...

  • You close the books for one company on Xero
  • You prepare a board pack and need to stand behind those figures
  • Your balance sheet has balances that depend on someone's memory of what they are
  • You want to catch backdated changes before your auditor does
  • You're responsible for producing clean working papers at year-end

Not for you if...

  • -You need consolidation across multiple entities
  • -You want driver-based or formula-linked reconciliations
  • -You're on a system other than Xero (QuickBooks, Sage, etc.)
Find out for free. No card, no sign-up.

Connect Xero read-only and check your last 6 closed months in one pass. Prefer to look around first? The demo company needs no sign-up either.

Read-only Xero connection Never writes to your ledger No lock-in · leave and take everything
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