Accounting Software in Thailand: Which to Choose, What It Costs, Cloud or Perpetual

Which accounting software fits which business? The short answer

Most small Thai businesses can start with a Thai cloud program such as FlowAccount or PEAK. Plans start at a few thousand baht a year, they issue tax invoices, withholding tax certificates and VAT reports, and the vendor updates them when the Revenue Department changes a form.

A perpetual licence (ซื้อขาด) such as Express suits a business whose accounting firm already works in it, or that wants to pay once and run the program on an office PC. Budget for the yearly maintenance fee as well. International cloud products such as Xero are built for other countries' tax systems and priced in US dollars, so they mainly fit foreign-owned companies whose group already uses them.

If the real problem is stock across several warehouses, branches, or departments re-keying each other's figures, you are looking for an ERP, not a different accounting program.

SyncEdge does not sell accounting software and has no partnership with any vendor in this guide. Every price here comes from the vendor's own website as read on 23 September 2026. Prices change, so check again before you buy.

What must accounting software handle for Thai tax?

Whatever you buy has to produce documents and reports the Revenue Department accepts. Check each item against the vendor's published feature list rather than a sales call:

• Full tax invoices carrying the items section 86/4 of the Revenue Code requires, plus the buyer's tax ID and the words “Head office” or “Branch no.”, which VAT notice No. 196 added from 2014
• Purchase and sales tax reports for the monthly VAT return, ภ.พ.30, due by the 15th of the following month on paper, or 8 days later when filed online
• Withholding tax certificates (50 ทวิ) for the people you pay, and the ภ.ง.ด.3 and ภ.ง.ด.53 returns, due by the 7th on paper or the 15th online
• e-Tax Invoice & e-Receipt, either by Time Stamp, sent by email and time-stamped by the certification system, or the full version signed with your own digital certificate
• e-Withholding Tax, where your bank deducts and remits the tax as it makes the payment. The cabinet approved keeping the reduced 1% rate for payments such as contract work, advertising, transport and rent through 31 December 2027. It runs through the bank, so ask how the program records those payments
• A chart of accounts your accountant can adapt, and bank reconciliation against your statement
• Stock with cost of goods sold, if you hold inventory
• Payroll with social security and ภ.ง.ด.1, if you would rather not run a separate payroll program

What accounting software is there? FlowAccount, PEAK, Express, Formula, Business Plus and two more compared

These seven cover most of what Thai businesses search for. The table sticks to what each vendor documents on its own website; where a feature is not listed, it says so rather than guessing.

Read the prices carefully, because vendors present them differently. PEAK states its prices exclude VAT. FlowAccount and SMEMOVE do not say either way. Express shows prices before and after VAT, Formula and Business Plus are sold by quotation, and Xero charges in US dollars.

Cloud subscription or perpetual licence: what is the difference?

The difference is when you pay and who keeps the program current. A subscription is a yearly or monthly fee that already includes updates, hosting and backups. A perpetual licence is one larger payment and the program is yours to keep, but updates, support beyond the basics and backups become your job, or an extra fee. Here is how that plays out:

• Up front: a cloud plan starts at nothing to a few thousand baht; Express starts at 20,330 baht including VAT for one PC
• Every year after: cloud is the full subscription again; a perpetual licence is optional maintenance, 6,420 baht a year including VAT for Express
• When tax rules change: cloud vendors update everyone at once. Express publishes updates to download and install yourself; for the 2014 tax-invoice changes it charged 5,000 baht to update at its office and 2,000 baht per form changed, before VAT
• Backups: FlowAccount says it runs on Amazon Web Services with regular backups, and PEAK on Microsoft Azure with automatic backups. On a desktop licence, Express tells customers to back up every day themselves
• Working away from the office: cloud runs in a browser or app. Express Single and LAN licences run only on office Windows PCs; remote use means renting Express on Cloud as well
• Adding users: cloud plans raise the user cap by tier; Express moves from Single to LAN for 16,000 baht before VAT
• Leaving: with a subscription, ask what access to past records remains once you stop paying; a perpetual licence keeps running for as long as you have a Windows PC

Is buying outright cheaper? Five years of cost, worked through

Not automatically. The chart adds up published prices, including VAT, for one small business over five years. FlowAccount Pro at 2,990 baht a year, taken as published because the page does not say whether VAT is included. PEAK Pro at 9,000 baht a year plus VAT, which is 9,630 baht. Express Single for one PC at 20,330 baht including VAT, plus maintenance at 6,420 baht a year from year two, assuming the free phone support that comes with the licence is enough in year one. No price rises, no add-ons and no payroll.

After five years, Express with maintenance comes to about 46,000 baht, PEAK Pro about 48,000 and FlowAccount Pro about 15,000. PEAK Pro's running total only passes Express in year five, and Express never gets below FlowAccount. Skip maintenance and Express stays at 20,330 baht, but you then install tax updates yourself and pay per fix. The three plans are not equivalent either: Express Single runs on one PC, PEAK Pro allows 10 users and FlowAccount Pro unlimited users, so price the plan you would actually need.

Is there free accounting software, and what is the catch?

Yes. FlowAccount, PEAK and SMEMOVE each have a free plan, Crystal Software Group gives SmartBiz away, and several vendors offer 30-day trials of their paid plans. The free plans work, but they leave out things that matter once you are VAT-registered or have staff.

Free Excel templates are fine for a freelancer who is not VAT-registered. They stop coping once you issue numbered tax invoices and withholding certificates and file every month, because each figure is typed twice and nothing checks the totals. The real cost of free usually arrives later: if a plan cannot export your full history, moving to another program means re-keying it or paying someone to. Before you put a year of records into any free plan, check that you can get them out.

The limits of each free plan, as the vendors list them:

• FlowAccount Free: one user and standard documents; withholding tax, e-Tax Invoice and bank reconciliation start on Standard
• PEAK Free: one user, up to 20 contacts and 5 products, entries back-dated at most two months, and no report export
• SMEMOVE Free: one user and up to 500 purchase and sale transactions a month
• SmartBiz 366 on cloud: free to use, with 5 baht charged for each report; the installed SmartBiz is free for up to 3 users on a LAN

Which fits a business like yours? Four example scenarios

These four businesses are composites built from situations common in Thai small businesses, not our clients. Find the one closest to yours and use it as a starting point before you compare plans.

Is accounting software enough, or should you connect your systems with SyncEdge?

For most small businesses, accounting software on its own is enough. If sales come in through one channel, or there are few enough to key in by hand without mistakes, you do not need us.

Connecting systems pays off when the same sale is typed twice: once in the POS, online store or LINE OA, and again in the accounting program. If your program has an API, we connect them so each sale arrives once with its tax details. When the business outgrows accounting software altogether, the next step is ERP advice, not one more connection.

See our ERP consulting and Odoo service

What should you ask a vendor before you sign?

These questions show the real cost and the way out. Ask them in writing and keep the answers.

• Is the price before or after VAT, and what will renewal cost next year?
• Which plan covers all the tax work I need: tax invoices, 50 ทวิ, ภ.ง.ด.3/53 files, the ภ.พ.30 report and e-Tax Invoice?
• How many users does the plan allow, and does my accountant's login cost extra?
• Can I export all my data, including past years, to Excel or CSV?
• How quickly do you update when the Revenue Department changes a form?
• Is there an API, which plan is it on, and are there usage limits or extra fees?
• Where is my data stored, how often is it backed up, and can I get a copy?
• What happens to my data if I stop paying?

How do you switch from Excel or an old program?

Pick a clean start date: the first day of your accounting year if you can, otherwise the first day of a month, once the previous month's ภ.พ.30 is filed. Bring across the chart of accounts, opening balances, customers and suppliers with their tax IDs and branch numbers, products with quantities and cost on hand, and any unpaid invoices and bills.

Ask the vendor for its import templates during the trial, then run one real month in parallel with the old system and switch only when the totals agree. Keep the old files and program readable afterwards, because the Accounting Act requires accounting documents to be kept for at least five years. The detailed steps for charts of accounts and opening balances are in our ERP vs accounting software guide, and they apply to moving between accounting programs too.

When is it time for an ERP instead?

When the problem sits outside accounting. If you run several warehouses or branches, manufacture to a bill of materials, or have sales, warehouse and accounts re-keying the same figures, a more expensive plan of an accounting program will not fix it. That is the ERP question, and our ERP vs accounting software guide covers the warning signs, the systems sold in Thailand, and what switching involves.

Where does SyncEdge fit in?

SyncEdge does not sell accounting software and has no partnership with any vendor in this guide, so choose whichever fits your business. Where we help is around it.

If sales from your POS, online store or LINE OA are still re-keyed into the accounting program, and that program has an API, we connect them so each sale arrives once with the right tax details. If the business has outgrown accounting software, we give independent ERP advice, and when Odoo fits, our own team implements it.