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AI invoicing tools for locksmiths in the UK

Most locksmith work is paid on the spot, so the invoice is really a receipt with a card payment link. The rest is agents and businesses on account, who need statements and reminders.

Prices were re-checked on each provider's own page; the date is next to each one. Rules and figures from GOV.UK are linked where they're used.

Paid on the day

Send the invoice with a payment link before you leave, or take card payment there and then. Keep the job photos with the invoice in case of a dispute.

Agents and businesses

Letting agents and businesses often want an order number on the invoice and pay monthly. Statutory interest on late business payments is 8% plus base rate (GOV.UK).

VAT

If your taxable turnover goes over £90,000 in a rolling 12 months, you must register (GOV.UK). Check with the VAT threshold checker.

The options, with prices

Tool	Price and free plan	UK notes and source
ServiceM8 Job management for trade and service businesses: quotes, scheduling, job cards, invoices and customer texts, priced by jobs a month rather than per user.	Free: £0 a month for 1 user and 30 jobs a month. Starter: £25 a month (50 jobs). Growing: £59 (150 jobs). Premium: £119 (500 jobs). Premium Plus: £269 (1,500+ jobs). All paid plans have unlimited users. 14-day free trial. Free plan: 1 user, 30 jobs a month, SMS at 5p each.	UK pricing in pounds on the UK site. Source, checked 15 October 2026
Tide A business account app with invoicing, expense cards and accounting integrations.	Free plan with no plan fee. Smart: £12.49 a month. Pro: £27.49 a month. Max: £69.99 a month. Essential tools for getting started with no monthly plan fee (transaction limits vary by plan).	UK; Tide is authorised by the FCA as an e-money institution. Source, checked 15 October 2026
Zoho Books Accounting software with a free plan for very small businesses and paid UK plans.	Free: £0. Standard: £12 a month (£10 billed annually). Professional: £24 (£20). Premium: £30 (£25). Per organisation. Free plan for sole traders and micro businesses.	UK pricing in pounds. Source, checked 15 October 2026
FreeAgent UK accounting software for sole traders, partnerships and small companies.	Sole traders: £19 a month. Limited companies: £33 a month or £330 a year. All excl. VAT, with 50% off the first six months when checked. Free with a NatWest, RBS or Ulster Bank business account, or Mettle (conditions apply). Free for eligible NatWest, RBS, Ulster Bank and Mettle customers; otherwise a 30-day free trial.	UK company, pounds. Source, checked 15 October 2026
QuickBooks Cloud accounting with invoicing, expenses and VAT, plus Intuit Intelligence AI features (some in beta).	Plans: Sole Trader Plus, Simple Start, Essentials, Plus and Advanced, each with a 30-day free trial. All include CIS calculation and submission; VAT submission isn't in Sole Trader Plus. Prices load dynamically on the UK pricing page, so check the current figure there. No free plan; 30-day free trial.	UK pricing in pounds. Source, checked 15 October 2026

What to check before you choose

Card payment links.
Photos attached to invoices.
Monthly statements for account customers.
Free plans for low volumes.

A prompt to start with

Paste this into ChatGPT or Claude, filling in the brackets:

Write a reminder to [letting agent] for invoice [number], £[amount], for a lock change at [address] on [date], order number [ref]. Our terms are [x] days. Under 70 words, British English.

Free tools

Price a job with the quote and VAT calculator (20%, 5%, 0% and reverse charge), or work out your day rate (see how much to charge per hour). Comparing job management apps? Read Tradify vs Jobber. If a business customer pays late, the late payment interest calculator works out the statutory interest you can add, and how to chase a late payment sets out the steps. Over £50,000 turnover? Making Tax Digital for Income Tax has applied since 6 April 2026.

Questions

Free options?

ServiceM8 (free for 1 user and 30 jobs a month), Tide and Zoho Books have free plans. Checked 15 October 2026.

Can I charge interest on late payment?

For business customers, statutory interest is 8% plus base rate. For householders, only if it's in your terms.

Are these prices in pounds?

Not all. Where a provider only publishes US dollar prices we show dollars, so check the price in pounds at checkout.

Do you get paid if I sign up?

Some links may become affiliate links, and we'll label them when they do. It doesn't change what we list. See how we make money.

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