Monthly & Quarterly Bookkeeping
Full transaction recording, categorisation and reconciliation on a monthly or quarterly basis — keeping your ledgers accurate and up to date throughout the year, not just at year-end.
Accurate, MTD-compliant bookkeeping and VAT returns for growing businesses across West London and Surrey. We keep your records clean, your VAT submissions on time and your mind free to focus on running your business.
Good bookkeeping is not simply about keeping HMRC happy — it gives you an accurate, real-time picture of where your money is coming from, where it is going and what your business is genuinely worth at any point in time. Without clean books, every business decision you make is based on incomplete information.
VAT is one of the most technically demanding obligations facing UK businesses. The rules around what can and cannot be reclaimed, which scheme is most tax-efficient for your turnover level and sector, and how to handle exceptions — such as partial exemption, the construction industry reverse charge or overseas supplies — are complex and regularly updated by HMRC.
At Harnett & Co we handle your bookkeeping and VAT as an integrated service — so your records are always in the right shape for your quarterly VAT return, your year-end accounts and your own management decisions.
A comprehensive service covering every aspect of your bookkeeping and VAT obligations — nothing is left to chance.
Full transaction recording, categorisation and reconciliation on a monthly or quarterly basis — keeping your ledgers accurate and up to date throughout the year, not just at year-end.
Full preparation and MTD-compliant submission of your quarterly VAT returns to HMRC. We review every return before submission and flag any anomalies that could trigger an enquiry.
Every bank and credit card transaction matched against your records. Any unreconciled items are flagged promptly — protecting against fraud, duplicate payments and errors before they compound.
We set up and manage your cloud accounting platform — Xero, QuickBooks or Sage — including migrating from spreadsheets or older systems. You get real-time visibility of your finances at all times.
Whether you are approaching the VAT threshold (currently £90,000 turnover), considering voluntary registration, or reviewing your current scheme, we provide clear, commercially-focused advice on the most efficient approach.
Behind with your records? We bring bookkeeping up to date quickly and accurately — whether that is a few months or several years — without disrupting your day-to-day operations or creating unnecessary risk with HMRC.
The domestic reverse charge for construction services is one of the most commonly mishandled VAT rules in the UK. We handle it correctly — including identifying which supplies are in scope and accounting for them properly.
ConstructionMonthly or quarterly profit & loss statements, balance sheet summaries and cashflow reports — giving you the management information you need to make confident business decisions between year-ends.
Selling goods or services outside the UK? Post-Brexit VAT rules for EU and international trade are complex. We handle import VAT, zero-rating, place of supply rules and EC Sales List obligations where applicable.
Making Tax Digital (MTD) is HMRC's programme to move the UK tax system entirely online. For VAT, MTD has been mandatory since April 2019 for most businesses above the registration threshold — and since April 2022 for all VAT-registered businesses regardless of turnover.
Under MTD for VAT, you must keep digital records and submit your returns using MTD-compatible software — manual calculations and paper records no longer satisfy HMRC's requirements. Penalties for non-compliance can be significant.
Every client we act for is fully MTD-compliant. We use HMRC-recognised software to maintain your digital records and submit returns directly — you never need to log into HMRC's portal.
HMRC offers several different VAT accounting schemes, each with different cash flow and administrative implications. Choosing the wrong one can cost your business money.
The default scheme — VAT is accounted for on an invoice basis when you issue or receive an invoice, regardless of when payment is made. Returns are filed quarterly. Most straightforward for businesses with regular, predictable income.
Best for: Businesses with consistent cash flow and straightforward supplies.
Under cash accounting, VAT is only paid to HMRC once your customer has actually paid you — and you only reclaim VAT on purchases once you have paid your supplier. Eases cash flow pressure for businesses with slow-paying clients. Available for businesses with taxable turnover up to £1.35 million.
Best for: Small businesses with variable payment timescales or late-paying clients.
Instead of tracking individual VAT on each invoice, you pay HMRC a fixed percentage of your gross turnover — the rate varies by trade sector (ranging from 4% to 16.5%). You charge clients the standard 20% but pay less to HMRC, keeping the difference as profit. Available for businesses with taxable turnover up to £150,000. The limited cost trader rate of 16.5% applies to most businesses with low costs.
Best for: Service businesses and sole traders with low input VAT costs.
Rather than quarterly returns, you file a single VAT return per year and make advance payments based on estimated liability — either 9 monthly or 3 quarterly payments. Reduces the volume of VAT administration and suits businesses that prefer a single annual review. Available for businesses with taxable turnover up to £1.35 million.
Best for: Businesses with stable, predictable VAT liabilities who want to reduce admin burden.
We make the transition to a new accountant as smooth as possible — most clients are fully set up within a week.
We discuss your business, current record-keeping approach, VAT situation and what you need from us. No obligation.
You receive a written proposal detailing exactly what we will do, how often, and what it will cost — agreed upfront with no surprises.
We set up or migrate your cloud accounting software, obtain access to your accounts and notify HMRC of our appointment as your agent.
Your bookkeeping is maintained regularly and VAT returns submitted on time every quarter. You receive confirmation after every submission.
All our bookkeeping work is carried out using HMRC-recognised, MTD-compatible cloud accounting software. This means your records are accessible securely from anywhere, always backed up and fully compliant with Making Tax Digital requirements.
If you are currently using spreadsheets or desktop software, we will migrate your data cleanly — with no disruption and no data loss. If you are already on one of these platforms, we connect as your accountant and take over the management of your account.
We work with a wide range of businesses across West London and Surrey — from sole traders in their first year to established limited companies with complex VAT requirements.
Simple, affordable bookkeeping that keeps your self-assessment records clean and ensures you never overpay on VAT or miss a filing deadline.
Full monthly bookkeeping integrated with your year-end accounts and corporation tax return — one joined-up service with no gaps.
CIS-aware bookkeeping with correct handling of the VAT domestic reverse charge — the most mishandled VAT rule in the construction sector.
Multi-channel income reconciliation, stock accounting and correct VAT treatment for Amazon, eBay, Shopify and direct sales combined.
Cash-intensive businesses with complex VAT — mixed-rate supplies, catering VAT rules and EPOS reconciliation handled accurately.
Post-Brexit cross-border VAT, import VAT recovery and the correct zero-rating of international supplies — complex rules handled precisely.
You are legally required to register for VAT once your VAT-taxable turnover exceeds the current threshold of £90,000 in any rolling 12-month period (or if you expect it to exceed that in the next 30 days alone). Voluntary registration below this threshold is also possible and can be commercially advantageous if your clients are themselves VAT-registered — allowing you to reclaim VAT on your own business costs. We advise on whether voluntary registration makes sense for your specific situation.
The VAT registration threshold is £90,000 of VAT-taxable turnover in any rolling 12-month period — raised from £85,000 in the Spring Budget 2024. This is one of the highest VAT thresholds in the world. Once registered, the deregistration threshold is £88,000. These thresholds are kept under review and we always ensure our clients are monitoring their position against them.
From January 2023, HMRC replaced the old surcharge regime with a new points-based penalty system. Each late return adds a penalty point to your record. Once you reach a set threshold (4 points for quarterly filers), a £200 fixed penalty is charged — and a further £200 for each subsequent late return. Late payment interest is also charged on unpaid VAT at 2.5% above the Bank of England base rate. Because we track and submit all returns on your behalf, late filing should never be an issue for our clients.
Yes — HMRC allows businesses to reclaim VAT on certain costs incurred before registration. For goods, you can reclaim VAT on items purchased within the last 4 years that are still held by the business at the date of registration. For services, the lookback period is 6 months. The rules have specific conditions and the claims must be made on your first VAT return. We review all pre-registration costs to ensure nothing is missed.
Introduced in March 2021, the construction services domestic reverse charge (DRC) applies to VAT-registered businesses in the construction industry that are within the scope of the Construction Industry Scheme (CIS). Under the DRC, the customer — rather than the supplier — accounts for VAT on applicable supplies. This applies to most building and construction work supplied business-to-business in the UK, with some exceptions including supplies to end users and employment businesses. Getting this wrong can result in significant VAT errors in either direction.
Making Tax Digital for VAT requires you to keep digital records of all your VAT transactions and submit your returns using HMRC-approved software — spreadsheets alone are no longer sufficient unless they use a compliant bridging tool. In practice, this means using cloud accounting software such as Xero, QuickBooks or Sage. We manage all of this on your behalf — you simply need to ensure your invoices and receipts reach us. We handle the digital record-keeping, reconciliation and submission entirely.
Absolutely. Catch-up bookkeeping is one of the most common reasons businesses first contact us. Whether you are a few months behind or have not properly reconciled your records for several years, we bring everything up to date systematically and accurately. We also deal with any resulting HMRC obligations — such as late VAT returns or outstanding penalties — so you can start fresh with a clean record.
Good bookkeeping throughout the year makes your year-end accounts faster, cheaper and more accurate. We prepare both as a joined-up service.
Learn more → 👥Payroll journals integrate directly with your bookkeeping records. We run both services together so everything reconciles without manual adjustment.
Learn more → 📝For sole traders and directors, clean bookkeeping records feed directly into your self assessment return — reducing preparation time and the risk of errors.
Learn more →Get in touch for an initial consultation. We'll discuss your current setup, explain exactly what we'd do differently and give you a clear, transparent quote — with no obligation to proceed.
We'll get back to you within one business day. Complete confidentiality guaranteed.
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You can also call us on 020 8977 9500.