How Large Accounting Firms Structure Offshore Delivery, and What Smaller Practices Can Copy

Introduction

It’s the second week of January. One partner is reviewing a CT600 at eleven at night. Another is preparing the self-assessment return she was supposed to be reviewing. Everyone is doing everything, and files come back from review needing rework because nobody had time to prepare them properly the first time.

Large accounting firms face the same deadlines. What they don’t have is partners preparing returns. Over the past decade, the Big Four and much of the mid-tier have built a separate delivery layer, a large part of it offshore. KPMG UK’s latest transparency report shows around a quarter of its audit practice based offshore, and in July 2026 the FRC said it would monitor how the largest firms govern these “extended team models” in its Annual Review of Audit Quality. ICAEW’s 2024 research found half of mid-tier firms had already offshored or outsourced at least one service line, and its 2026 edition found more mid-tier firms expecting to increase offshoring than outsourcing.

For small accounting firms, the lesson isn’t the scale. It’s the structure. After more than a decade preparing work for UK practices, we’d say the firms that get the most from offshore support treat it as an operating model, not a cost hack. This article explains the model, then shows how a three-partner practice can run it.

What large accounting firms actually build

Strip away the branding on the delivery centres and the design is simple. Work moves through four layers:

• Client layer: partners and managers own the relationship, the judgement calls and sign-off.
• Review layer: experienced staff challenge the work, clear it or send it back.
• Preparation layer: the delivery team produces working papers, drafts and returns to a defined standard.
• Operations layer: scheduling, job tracking, WIP and quality measurement.

The offshore team sits in the preparation layer, and sometimes provides the first level of review. It works because every handoff between layers is defined in advance: what arrives, in what format, and what goes back.

The FRC’s comments are about audit, but the principle carries straight across to accounts and tax work. Governance, oversight and accountability stay with the UK firm. Offshoring moves the work, not the responsibility.

The four building blocks

1. Separate preparation from review

In a large firm, the person who prepares a file never approves it, and they rarely work the same hours. A typical review hierarchy runs:

1. Preparer self-review against a checklist.
2. First-level review for technical accuracy: balances tie, reconciliations agree, the tax computation flows to the return.
3. Manager review for judgement and context: does this make sense for this client?
4. Partner review of flagged risk areas, then sign-off.

Two habits hold the hierarchy together. First, review notes are written down and answered, not cleared silently by a reviewer who fixes things themselves. That written trail is exactly the evidence of supervision regulators look for. Second, preparers know where their authority ends. Unusual coding, capital-versus-revenue calls above a set amount, director’s loan account balances, and anything involving tax judgement go on a query list rather than being assumed.

Written review notes also become your training loop. Count them per file. If the number isn’t falling by the third month, fix the brief or the checklist before you blame the preparer.

2. Standardise working papers

Large firms review quickly because every file looks the same. A reviewer knows where fixed assets sit, how tick-marks are used and which schedule supports each balance.

A small practice gets most of that benefit from a standard year-end index. For example:

• A. Completion, queries and points for the reviewer
• B. Trial balance, journals and prior-year comparison
• C. Bank and cash
• D. Debtors and prepayments
• E. Fixed assets and capital allowances
• F. Creditors and accruals
• G. VAT and PAYE control accounts
• H. Director’s loan account
• I. Corporation tax computation
• J. Accounts and disclosure checklist (FRS 102 Section 1A or FRS 105)

The rules are simple: every balance ties to a working paper, and every working paper shows its source, preparer, and date. That’s how our year-end accounts come back, with lead schedules, reconciliations and working papers in a reviewer pack, and it’s why a manager can open a file cold and review it in one sitting.

3. Define a single handover format

Most friction in offshore delivery isn’t technical. It’s the handover. Large firms fix it with one format, used on every job and every service line.

Going out, the job brief: client and period, scope, software and access, deadline, last year’s file, known issues, the threshold for raising queries, and who answers them.

Coming back, the reviewer pack: the draft output, working papers, a query list split into “client to answer” and “reviewer to decide”, variance commentary against last year, points for the reviewer’s attention, and time spent.

The query list does most of the work. It separates what the preparer didn’t know from what they assumed, which is precisely what a reviewer needs to see. A preparer who assumes silently costs you more review time than one who asks too many questions.

4. Plan capacity against the deadline calendar, not headcount

Small practices tend to think in headcount: “we need another senior.” Large firms think in hours against dates: “we need 700 preparation hours between July and November.”

The UK compliance calendar makes that kind of planning possible, because the peaks are fixed:

• VAT: one month and seven days after each quarter end (VAT returns).
• Payroll and CIS: RTI submissions on or before each payday; CIS returns by the 19th of each month (CIS returns).
• P11Ds: 6 July.
• MTD for Income Tax: since April 2026, quarterly updates for sole traders and landlords above the £50,000 threshold, due 7 August, 7 November, 7 February and 7 May.
• Self assessment: 31 January.
• Companies: accounts to Companies House nine months after the year end, corporation tax payable nine months and a day after, and the CT600 due within 12 months.

Now look at the collision most practices live with. March year-end companies must file accounts by 31 December, just as self assessment builds towards 31 January. Take 120 March year-ends at around six preparation hours each (an illustrative figure). That’s 720 hours that must be prepared, reviewed and cleared of queries before Christmas, on top of your SA book.

The method is straightforward. List every recurring job with its deadline and last year’s hours. Work backwards: the preparation deadline is the filing deadline, minus review time, minus a realistic window for client queries. Plot those hours week by week against your internal capacity. The gap is what you book offshore, months ahead, not in the week it starts to hurt.

Translating it: a three-partner practice

Here’s how the same structure looks at a three-partner firm with a few hundred accounts clients, a busy self-assessment book and a handful of payrolls.

Three partners keep the client relationships, planning conversations, tax judgement and sign-off. They review flagged points and high-risk files, not every tick-mark.

One internal reviewer, a qualified manager or experienced senior, is the first line of review on every file. They own the checklists, answer preparer queries within an agreed time and give feedback on every job. It’s the most important role in the model, and the one practices most often skip.

Two offshore preparers, named and dedicated, work inside your software on bookkeeping, VAT, year-end accounts, CT600 drafts, and self assessment preparation. Every file gets our own internal check before it leaves our desk, so your reviewer is never the first person to look at it.

Client chasing stays in-house unless you decide otherwise. Your clients know your team; the offshore team works from what your team collects.

The daily rhythm matters more than the org chart. India is five and a half hours ahead of the UK in winter and four and a half in summer, which leaves a comfortable overlap for a 15-minute call each morning to clear yesterday’s queries. Add a weekly WIP meeting and a monthly look at the quality numbers.

Don’t switch everything on at once. In ICAEW’s conversations with larger firms, the recurring advice was to build good foundations and grow slowly at first. Start with one repeatable service line, such as VAT or monthly bookkeeping, and get the checklist and handover right. Then add year-end accounts and CT600, and bring self assessment in well before November.

The governance a smaller firm still needs

Large firms have operations teams. You need three things instead.

Job tracking. Every job carries a status: records received, in preparation, queries with client, in review, with partner, sent for approval, filed. The offshore team updates its own statuses in your practice management software, so nobody has to chase to find out where a file is.

WIP visibility. A weekly view of jobs by stage against deadline, plus hours spent against budget. Watch two things closely. Files stuck at “queries with client” are a records problem, not a capacity problem. Jobs running well over budget usually mean scope creep or a weak brief.

A named escalation contact on both sides. In your firm, one person who answers technical questions and decides when something goes to a partner. At the provider, one person who owns delivery and fixes problems. That’s why we assign a dedicated account manager and named team members to every engagement. Rotating pools lose context, and context is most of what makes review fast.

Measure a handful of numbers monthly: review notes per file, rework rate, turnaround against agreed dates, and missed deadlines. Our standard turnaround is five working days, and you should expect any provider to report against theirs without being asked. Data security belongs in the same governance pack; our guide to client data security when you outsource accounting work covers the controls and paperwork.

What this model won’t fix

Be honest about the limits. Offshore capacity won’t fix clients who send records late, fee scopes that were never defined, or partners who won’t let go of preparation. And the real saving isn’t mainly the hourly rate. It’s partner time moved from preparing to advising, and capacity that follows the calendar instead of sitting idle in April.

Not every outsourced accounting firm is set up to work this way, either. Ask any provider to show you their job brief template, a sample reviewer pack and how they report WIP. If they can’t, you’ll end up building the operations layer for them.

Where to start

Pick the workflow that costs your partners the most evenings, write down what a finished file should look like, and test it on real work. Our services cover bookkeeping, VAT, payroll, CIS, year-end accounts, CT600 and self assessment, across the models most practices use: a dedicated resource, flexible hourly support, fixed job pricing or peak-season capacity.

Start with a free trial on one workflow; most practices are working with us within two to three working days of a signed agreement. Or talk to our team about mapping your deadline calendar first.

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Frequently asked questions

How do large accounting firms use offshore teams?

Mainly as a preparation and first-review layer. Delivery centres produce working papers, reconciliations, drafts and returns to firm-wide templates, while UK partners and managers keep client relationships, judgement and sign-off. The structure depends on standard files, a defined handover and capacity planned against deadlines.

Do the Big Four send work to India?

Yes. Deloitte, EY, PwC and KPMG all run large delivery centres in India that support UK and other member firms. KPMG UK’s transparency reporting shows around a quarter of its audit practice based offshore, and the FRC said in July 2026 that it will monitor how the largest firms govern these arrangements.

What is an “extended team model”?

It’s the FRC’s term for offshore teams working as part of UK engagements, increasingly on work beyond routine testing and admin. The regulator’s point is that responsibility, supervision and review still sit with the UK firm.

Can small accounting firms realistically copy the large-firm model?

Yes, in a simplified form. The parts that matter (separate preparation and review, standard working papers, one handover format and deadline-based capacity planning) don’t need scale. A three-partner practice can run them with two offshore preparers, one internal reviewer, and basic job tracking.

How many offshore preparers can one internal reviewer handle?

Two is a sensible starting point for most small practices. The real limit is review time per file, so measure it. If review notes aren’t falling after the first few months, fix the brief and checklists before adding preparers.

Won’t reviewing offshore work take as long as doing it myself?

It does at the start if files arrive in different formats with no query list. Once working papers are standardised and preparers flag their assumptions instead of hiding them, review becomes checking and challenging rather than re-performing. That’s the whole point of the model.

What work should stay in-house?

Client relationships, planning conversations, tax judgement, AML decisions, final review and sign-off, and advisory work. Records chasing usually stays in-house too, because clients respond faster to people they know.

What should a standard year-end working paper file include?

A completion and queries section, the trial balance and journals, a section for each balance sheet area (bank, debtors, fixed assets, creditors, VAT and PAYE controls, director’s loan account), the tax computation and a disclosure checklist. Every balance should tie to a working paper showing its source, preparer and date.

What is a reviewer pack?

The standard bundle a preparer hands back: the draft accounts or return, working papers, a query list split between client questions and reviewer decisions, variance commentary against last year, points for attention and time spent. Using one format for every job makes review much faster.

How do we plan capacity around UK deadlines?

List every recurring job with its filing deadline and last year’s hours. Work back to a preparation deadline by subtracting review time and a window for client queries, then plot hours by week against your internal capacity. Book offshore capacity for the gaps months ahead, especially the December accounts and January self-assessment overlap.

What’s the difference between offshoring and outsourcing?

Outsourcing means a third party does the work. Offshoring means the work is done in another country, whether by your own staff or a provider’s. Many small practices use both at once: a dedicated team employed by a provider overseas, working inside the practice’s own systems.

How long does it take to get an offshore team working smoothly?

Access and onboarding can be quick; we’re usually working with a practice within two to three working days of a brief and signed agreement. Reaching a steady rhythm takes longer, as checklists settle and review notes fall, so start with one service line well ahead of a peak.

How do we keep WIP visible with an offshore team?

Put every job in your practice management software with a clear status and a budget, and have the offshore team update its own statuses. Review a weekly WIP report by stage and deadline, and look hardest at jobs waiting on client records or running over budget.

Who should be the escalation contact?

One named person in your firm for technical queries and partner escalation, and one named person at the provider who owns delivery. Agree response times for both. Without named contacts, queries sit in inboxes and deadlines slip quietly.

Is it better to subcontract peak work to large accounting firms near me?

Occasionally, for specialist work. For routine compliance, it rarely helps: local firms hit the same deadlines at the same time, charge UK rates and may see your clients as prospects. Offshore capacity is available precisely when UK capacity is scarce, and you can book it for the peak only.

Does using an offshore team change our professional responsibility?

No. Your firm stays responsible for the work, the review, the client relationship and the data. Tell clients in your engagement letter, put a data processing agreement and transfer safeguards in place, and keep evidence of review. Our client data security guide covers the detail.

Is accounting outsourcing in the UK only for larger firms?

No. ICAEW found half of mid-tier firms had already offshored or outsourced at least one service line, and smaller practices can use flexible models: a dedicated resource, hourly support, fixed job pricing or seasonal capacity. Our services page sets out the options.

What do outsourced accounting firms need from us to get started?

Software access with the right permissions, your checklists and house style, last year’s files, a job brief for each assignment and a named contact for queries. The better the first brief, the faster the second job goes.