The quick answer
DIY works when things are simple (non-VAT or straightforward VAT, few transactions, no payroll, and you have the time). Outsourcing wins once you’re VAT-registered, running payroll, growing fast, or falling behind on month-end reviews.
Because errors, late filings and missed claims get expensive and distracting. All VAT-registered businesses must now keep digital VAT records and file via compatible software, so if VAT is (or soon will be) in your world, your processes need to be tight. GOV.UK
Heights’ take: start DIY if you’re very small and organised; switch to a hybrid (you do the day-to-day, we do month-end review) or fully outsourced as soon as VAT, payroll or growth kick in.
DIY vs Outsource at a glance
| Factor | DIY | Outsource (Heights) |
|---|---|---|
| Your time each month | 5–10+ hours on posting, reconciling, VAT/PAYE checks | 1–2 hours reviewing a clean month-end pack |
| Compliance burden | You manage MTD for VAT software, FPS/EPS and PAYE deadlines | We operate MTD-compatible workflows and watch HMRC deadlines for you |
| Quality & review | Easy to miss cut-offs, accruals, VAT codes | Second-pair review, proper cut-off, VAT review notes |
| Cashflow visibility | Patchy, depends on discipline | Clean P&L/BS + rolling forecast and actions |
| Total cost | Software + your time + risk of errors/rework | Fee + saved time + fewer errors/penalties |
The real cost of DIY vs outsourcing
Your time has a cost. If your effective hourly value is £120 and you spend 7 hours/month on bookkeeping, that’s £840/month of opportunity cost, even before software and rework.
Software & add-ons: bookkeeping app, bank feeds, receipt capture, payroll. If you’re VAT-registered, you must keep digital records and file via MTD-compatible software. GOV.UK
Hidden costs: re-work after year-end, missed VAT claims, late VAT submissions (penalty points lead to £200 fixed penalties once you hit the threshold), late PAYE (interest/penalties). GOV.UK
Compliance you can’t ignore in 2025/26 (so your decision isn’t risky)
Record-keeping (how long to keep records)
- Sole traders/landlords: keep Self Assessment records at least 5 years after the 31 January deadline for the relevant tax year. GOV.UK
- Limited companies: keep accounting records 6 years from the end of the last financial year they relate to (longer in certain cases). GOV.UK
VAT: thresholds, digital records and penalty points
- The VAT registration threshold is £90,000 and deregistration £88,000 (effective 1 April 2024). GOV.UK
- All VAT-registered businesses must now keep digital records and submit returns with compatible software (MTD for VAT). GOV.UK
- Late submission penalty points apply to VAT returns for periods starting on/after 1 January 2023. Reach the points threshold and it’s a £200 penalty, with another £200 for each subsequent late return. GOV.UK
Payroll (if you have staff)
- FPS must be sent on or before payday. GOV.UK
- EPS (if applicable) by the 19th following the tax month. GOV.UK
- PAYE payable to HMRC by the 22nd of the following tax month if paying electronically (19th if by post). GOV.UK
MTD for ITSA (sole traders/landlords)
- Mandation starts 6 April 2026 for qualifying income > £50,000, 6 April 2027 for > £30,000; and from 6 April 2028 for those with qualifying income > £20,000 (per the HMRC policy paper). GOV.UK
Planning next steps? See MTD for ITSA Explained for who’s in scope, what “qualifying income” means, and how quarterly updates work.
A simple decision tool (7 quick questions)
- Are you VAT-registered now (or expect to cross £90k within 12 months)? GOV.UK
- Do you run payroll or plan to hire? (FPS/EPS/PAYE timings apply.) GOV.UK
- Do you have multiple income streams/locations?
- Are you consistently closing the month and reconciling by a set date?
- How many hours/month are you spending on bookkeeping?
- Do you trust your P&L/BS and VAT return each month?
- Will MTD ITSA affect you in 2026/27/28?
Score yourself:
- Mostly “No/Low”: DIY or Hybrid might be fine (with quarterly/month-end reviews).
- Mostly “Yes/High”: Outsource core bookkeeping and reviews.
What “good bookkeeping” looks like each month
- Bank feeds live; all items posted and fully reconciled
- VAT codes reviewed; purchase invoices matched
- Payroll journals posted; director’s loan reviewed
- Cut-off applied (accruals/prepayments), aged debtors/creditors checked
- VAT return reviewed (penalty-point regime in mind) and PAYE set for payment by the 22nd if due GOV.UK
Use our DIY Bookkeeping Checklist to follow this step-by-step.
If you stay DIY: the minimum viable setup
- MTD-compatible software (if VAT-registered) with bank rules and receipt capture. GOV.UK
- A fixed monthly close routine (aim for 90 minutes): reconcile, review VAT codes, run P&L/BS, note actions.
- Quarterly or month-end review with an accountant to sanity-check VAT/PAYE and spot issues early.
Helpful follow-ons: MTD for ITSA Explained (for sole traders/landlords), Payroll Services UK (if you’re hiring or already paying staff).
If you outsource: what to expect (and insist on)
- Service cadence: weekly posting; month-end pack by day X; clear escalation route.
- Quality bar: second-pair review, VAT notes, reconciled control accounts, debtor/creditor actions.
- Impact: fewer errors, cleaner VAT/PAYE compliance, and a management pack you actually trust—fuel for a rolling 52-week forecast and better decisions via Cashflow Forecasting Services.
Short worked scenarios (plain-English numbers)
These are illustrative only, your volumes, VAT position and payroll will swing the outcome. If you want a tailored view, ask for Heights’ 15-minute DIY vs Outsource calculator.
Scenario A: Micro business, non-VAT, no payroll
- ~60 transactions/month. You spend 4 hours posting/reconciling and 1 hour on month-end checks.
- Your effective hourly value: £120. Your time cost ≈ £600/month.
- Outsourced quote: £250–£350/month for posting + month-end pack (light touch).
Verdict: If you’re disciplined and happy to learn, DIY + quarterly review can work. If time is your pinch point, outsourcing likely pays for itself in reclaimed hours.
Scenario B: VAT-registered service SME with payroll (6 staff)
- ~300 transactions/month, quarterly VAT, monthly payroll.
- You must keep digital VAT records and file with compatible software; late filings accrue penalty points (£200 when the threshold is hit). FPS must be on or before payday; EPS by the 19th if needed; PAYE by the 22nd electronically. GOV.UK
- Internal “DIY” time: 10–12 hours/month (posting, payroll journals, VAT reviews, debtors/creditors). At £120/hour, that’s £1,200–£1,440 in time cost, before risk of rework.
- Outsourced quote: £550–£850/month including review and month-end pack.
Verdict: Outsourcing is usually cheaper in total economic cost and significantly lowers compliance risk.
FAQs (People Also Ask)
Is DIY bookkeeping allowed if I’m VAT-registered?
Yes—but you must keep certain VAT records digitally and use compatible software to submit returns (MTD for VAT). GOV.UK
What’s the VAT registration threshold now?
You must register once your rolling 12-month taxable turnover exceeds £90,000; you can apply to deregister at £88,000. (Effective 1 April 2024.) GOV.UK
How long must I keep records?
Self Assessment: 5 years after the 31 January deadline for the relevant year. Companies: 6 years from the end of the last financial year (sometimes longer). GOV.UK
When are payroll reports and payments due?
Send FPS on or before payday; EPS by the 19th; pay your PAYE by the 22nd electronically (19th by post). GOV.UK
When will MTD for ITSA affect me?
From 6 April 2026 for qualifying income > £50,000, 6 April 2027 for > £30,000, and from 6 April 2028 for those with qualifying income > £20,000. GOV.UK
What to do next
- Very small and organised? Start with the DIY Bookkeeping Checklist and set a 90-minute monthly close.
- VAT, payroll or growth in sight? Talk to us about a tidy, low-friction handover via Payroll Services UK and an outsourced bookkeeping + month-end review plan.
- Want real cash control? Pair clean books with a rolling 52-week forecast inside Cashflow Forecasting Services, so you’re deciding with confidence, not guesswork.
Why Heights?
Because we’re not just “doing the books”. We build a Month-End → Forecast → Action loop: reconciled numbers, clear insights, and concrete actions that help you keep more of what you earn—without HMRC drama.