Tax filing for Shopee, Lazada, TikTok Shop and live-selling pages

Most people who start selling online assume tax accounting simply means counting whatever lands in the bank each month. In reality, that deposit is what remains after the platform strips out several layers of cost — transaction fees, category-based commission, promotional charges the seller opted into, and part of the shipping cost the platform fronted and later deducted back. The correct base for tax calculation is never the deposit alone; it always has to be checked against the gross sales figure the platform's own report shows first.

The e-Payment rule requiring banks to report deposit patterns meeting certain criteria to the Revenue Department raises the stakes further. A seller's bank account receiving money from several channels at once — customer cash-on-delivery transfers, platform payouts, and sometimes personal transfers mixed in — can easily produce a deposit pattern frequent and large enough to trigger that reporting threshold. Without documents clearly separating where each sum came from, being asked to explain the account after the fact can happen even with no intent to avoid tax whatsoever.

Another source of confusion is counting revenue from orders that never fully completed. Most platforms generate an order record the instant a customer clicks buy, but that order can still be cancelled before shipping or bounce back when the customer refuses delivery, a pattern especially common with cash-on-delivery selling where refusal rates run noticeably higher than prepaid sales. A seller who records income from the full order count without pulling the return and cancellation report to adjust it ends up filing a revenue figure well above reality, paying more tax than necessary for no good reason.

The most common question is when to move from selling as an individual to a company. The answer never hinges on revenue alone; it needs the cost structure and net profit examined together, because personal income tax runs on a progressive scale that climbs with net income, while corporate tax follows a flatter structure tied to company size. Past a certain profit level, incorporating can make the tax burden more predictable, but it trades that for heavier bookkeeping and audit obligations in return. A seller should see the real numbers under both structures before deciding either way.

VAT registration is another decision point online sellers often reach sooner than expected, because combined revenue across several platforms at once can clear the 1.8 million baht annual threshold faster than selling through a single channel would. Once that threshold is crossed, registration must happen within the statutory window, tax invoices must start being issued, and PP30 filed every month. A seller who does not track cumulative revenue across platforms continuously can find out too late without ever meaning to fall behind.

Advertising spend paid to the platform is another cost easily overlooked when calculating net profit, since ad charges are sometimes deducted straight from sales before the payout arrives, leaving the seller never seeing the actual amount spent. Without pulling that ad spend report to record as a separate expense, the accounting profit comes out overstated even though the cash left in hand tells a lower story. This mismatch throws off any tax plan built without checking every category of source data.

Live selling on Facebook or TikTok adds one more layer of complexity, since some payments come as direct transfers into the seller's personal account instead of routing through a platform's payment system, leaving no automated sales report to pull the way a marketplace store would provide. Sellers in this position have to rely on manually recording sales from chat messages or order comments, which carries a far higher risk of items slipping through without a consistent daily summary routine in place.

In the end, what sets online sellers apart from a traditional business is the sheer number of data sources that must be pulled together before the real figure emerges — not one ledger book but several platform reports at once. Having someone gather that data, reconcile it every month, and file returns consistent with what the authorities already see saves a seller from sitting through the number-chasing personally, and cuts the risk of an unknowingly wrong filing caused by systems that were never built with tax in mind to begin with.

Sellers running live-selling on Facebook or Instagram often collect payment through direct transfers into a personal account rather than through a platform's checkout system, which means no automated sales report exists to help with reconciliation the way a marketplace store has. The seller has to log orders manually from chat messages and comments, a process prone to gaps when hundreds of viewers order at once during a live session. Come filing time, the self-recorded sales figure usually falls short of what the bank actually shows, since orders forgotten or mislabeled with the wrong customer name never made it into the log. Bringing in an automated order-logging tool tied to the chat feed, reconciled against the bank statement weekly rather than waiting until month-end, cuts the risk of the discrepancy compounding into something hard to unwind.

Sellers using a platform's own warehouse for storage and fulfillment face an inventory-counting challenge different from keeping stock in-house, since there is no way to physically verify goods on hand the way an owned warehouse allows; the seller relies on periodic stock reports the platform issues, which sometimes carry discrepancies from damaged goods in storage or returns not yet re-entered into the system. Without regularly reconciling the platform's stock report against the seller's own inventory ledger, the cost of goods sold calculation drifts from reality, and the gross margin shown on the statements distorts as the gap accumulates over time. Requesting the platform's stock report every month and adjusting the books the moment a discrepancy surfaces is a step that should never be skipped.

Sellers who start hiring packing staff or chat admins as the business grows often forget that wages still fall under the same withholding tax and social security rules as any other business, especially while still selling as an individual with no formal payroll system in place. Many pay staff in cash daily or weekly with no supporting paperwork, so when annual personal income tax filing comes around there is no wage expense evidence to claim as a deduction, resulting in more tax paid than necessary had the wage records been kept properly from the outset. Starting with even a simple employment agreement and logging every payment, even for part-time help, provides the expense evidence needed to file correctly and in full.