Postlock for accountancy practices

You filed the accounts. Does Xero still agree?

Year-end accounts go out, the client says thanks, and everyone moves on - until a supplier invoice gets backdated into the filed year, and nobody tells you. Next year's comparatives quietly stop matching what you filed. Postlock snapshots every client's year-end and watches it, so you catch that before it becomes a balancing journal.

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Read-only. Postlock never writes to your clients' Xero ledgers; it only watches and reconciles.

Caught automaticallyClient posted a backdated invoice 4 days after the year-end was signed off. Already attributed.

postlock.co/practice

2 of 14 clients' filed accounts moved Action

Client	Year end	As filed	Xero now	Movement
Thornbury Care Homes Ltd Filed 02 Oct · 3 changes	Dec 2025	2,310,880	2,322,880	+12,000
Brackenfield Joinery Ltd Filed 08 Oct · 1 change	Apr 2026	64,210	61,710	−2,500
Pennine Supplies Ltd Filed 05 Oct	Mar 2026	482,300	482,300	✓ Agrees
Coastal Marketing Group Ltd Filed 01 Oct	Mar 2026	1,204,560	1,204,560	✓ Agrees

Watchdog last ran 2 min ago · 14 clients monitored

The bread and butter

Year-end assurance, not a management-accounts add-on.

Not every client gets monthly management accounts - some do, some are quarterly, plenty are neither. But every client gets a year-end. That's the one figure Postlock anchors on: does what you filed still match what's in Xero, right now?

The verdict, up frontOne line tells you whether next year's comparatives are safe.

postlock.co/year-end

⚠ The accounts filed for December 2025 no longer agree with Xero.

£12,000 of movement across 3 lines since sign-off. Left as is, next year's comparatives won't match what was filed - it either gets fixed at source now, or fudged with a balancing journal later.

Account	As filed	Xero now	Movement
Trade creditors	61,710	64,210	+2,500
Retained earnings	1,282,500	1,292,000	+9,500

The Year-End Assurance Report - the check every client gets, whether or not they get management accounts.

If a client does get monthly or quarterly management accounts from you, lock those months too and Postlock watches them the same way - shown as a supplementary section on the report, never the headline. It's there if you use it, invisible if you don't.

The problem

You're responsible for numbers you can't control.

Year-end

You prepare and file the accounts. The client signs them off. As far as anyone's concerned, that year is closed.

Any time before next year-end

A supplier sends a corrected invoice. The Shopify integration syncs a historic order. Someone tidies up an old payroll journal - backdated into the year you already filed. The client doesn't think to tell you. It's already done.

Next year's filing

The comparative column doesn't tie back to what you actually filed. You're either restating with no paper trail for why, or quietly posting a balancing journal to make it look like nothing happened. Professional liability, client relationship, your time - all on the line while you dig through a year-old Xero file to find the difference.

With Postlock

Postlock names it by the next morning - the document, the person, the date. You raise it with the client the same year, with the full paper trail, instead of discovering it as an unexplained comparative twelve months later.

Same yearRaised with the client before the next filing, not after.

postlock.co/integrity

Brackenfield Joinery · YE Apr 2026 · filed 08 Oct 09:42

1 change since sign-off Action

Account	Was	Now	Movement
Trade creditors	61,710	64,210	+2,500

Document posted after sign-off

Type	Ref	By	Amount
Bill	INV-2841 Pennine Timber Supplies	S. Bracken (client admin)	2,500.00

Per-client integrity - the change, the invoice, who posted it.

For practices, this means

Three things that change how you close.

Every client's filed year-end, watched

Whether or not they're on management accounts, every client gets a year-end. Postlock snapshots it at sign-off and checks it against Xero on a schedule - you're told by the next morning if a filed year moves, not when next year's comparative doesn't tie.

Your whole book on one screen

Every client's filed year-end sits alongside the current Xero balance, sorted by drift. The clients whose numbers have moved surface at the top. You don't check each client manually - the dashboard shows you exactly where to look.

Management accounts, if and when you do them

For the clients you do monthly or quarterly packs for, lock those periods too - same watchdog, same audit-ready Excel format, same change detection. Entirely optional, per client, and never assumed.

Need segregation of duties? Roles and a two-person sign-off are built in: preparer submits, a different reviewer approves, self-approval blocked, and the approval log lands in the Excel pack.

Fix-list export

Send the client exactly what changed.

Rather than a phone call and a screenshot, a one-click export lists everything that moved since a filed year-end (or a locked management-accounts period) and what you need from the client to fix it - branded, ready to forward. Every account has it.

Whole-book closed-months check

Scan every client before you've even connected properly.

Connect Xero read-only and see, in one pass, every client with a document posted after its period closed - no lock or year-end snapshot needed first. It's the free way to see what Postlock would already have told you.

Pricing

What your book actually costs.

First 10 clients included in the base, then £8/client. No per-seat charge, no "talk to us" wall - the slider shows the exact number.

Practice

from£99 /month

Whole-book watchdog, emails only when something moves, one Excel format for every client.

Clients10

10100+

Start 14-day trial

Self-serve up to 50 clients. Beyond that - talk to us.

Founding offer: we need 10 active customers for Xero App Store certification, so if you are one of the first 10 you get 75% off for as long as you stay subscribed - code FOUNDING75 at checkout.

See the full breakdown, including Solo and Team, on pricing.

The obvious question

"Doesn't Dext already do this?"

Partly, yes - and you should hear that from us rather than find it out. Dext's Data Health add-on logs lock-date changes Xero itself doesn't record, and flags transactions posted into a period you've already filed at Companies House. If Dext is already in your stack, you have some of this.

The difference is what each one knows. Dext finds transactions entered after a date. It has no record of what you reported, because nothing wrote the figures down at sign-off. Postlock snapshots every balance when you sign off, so it says "Trade Debtors was £45,200 in the pack you sent and is £46,750 now" rather than "something was posted late" - and it does that for every monthly sign-off, not just the filed year, because your sign-off is the anchor and you sign one every month.

If the filed year is your only worry, Dext covers it. Buy the one you'll actually open. The full comparison is here, including where we come off worse.

Is this for you?

Postlock for practices, plainly.

This is for you if...

You file year-end accounts for multiple Xero clients
You need to know by the next morning if a client posts into a year you've already filed
You want a straight check before next year's comparatives go out, not a surprise after
You need a preparer / reviewer approval trail for PI purposes
You do management accounts for some clients (monthly, quarterly, or not at all) and want them watched too, when you do

Not for you if...

-You need multi-entity consolidation (look at ScaleXP or Numeric)
-You want driver-based or formula-linked reconciliations
-You're looking for a full client portal or task-management workflow

See it on your own book, free.

Connect Xero read-only and scan every client's last 6 closed months in one pass - no card, no commitment.

Scan your whole book free

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

Check my closed months · free