Records ingestion and mapping
Trial balance, general ledger, statements and supporting documents loaded once, with an assistant proposing the mapping and flagging what is missing.
CIT24
A corporate tax operating system, not a form generator.
CIT24 converts trial balance, general ledger, financial statements and supporting documents into an explainable, reviewable Thai corporate tax position under sections 65, 65 bis and 65 ter of the Revenue Code — and remembers every position for next year.
DomainThai corporate income tax
AnchorRevenue Code s.65, 65 bis, 65 ter
OutputsProvision, PND51, PND50
EnginesAI evidence + deterministic CIT24-CALC
ModesCorporate · Advisory · Audit defence
Current scopenon-BOI companies, standard s.67 bis (1) estimation
Upload→Map→Rule engine→Tax adjustment ledger→Provision / PND51 / PND50→Review→Audit defence
The problem
The computation is rebuilt every year from a file nobody wants to inherit
Corporate tax closes on a spreadsheet: adjustments typed from memory, a non-deductible bucket that explains nothing, and the reasoning for last year's position living with whoever prepared it. When the Revenue Department asks why an amount was added back, the answer has to be reconstructed.
CIT24 makes the adjustment the unit of record. Each one carries its rule, its evidence, its author and its approval — and comes back next year as a position with a history rather than a number to re-derive.
Who it is for
Thai corporates
Finance and tax teams running a single-entity close, provision and filing cycle.
Advisory and accounting firms
Multi-client workspaces on one methodology, with per-client evidence kept separate.
Teams facing an RD enquiry
Audit-defence mode: a request tracker and an evidence room built from the working papers.
Groups preparing for more
Positions and entity data that feed TP24, GMT24 and LAW24 rather than being re-entered.
Core capabilities
01
02
Section 65 ter rule library
Named, cited rules for the adjustments Thai companies actually make — not a single non-deductible bucket that hides the reasoning.
03
Tax adjustment ledger
Every adjustment versioned. Approved records are never overwritten, so a prior-year position stays exactly as it was approved.
04
Reversal Guardian
Differences that must reverse are tracked to the period they reverse in, so a timing adjustment cannot quietly become permanent.
05
Corporate tax memory
Last year’s positions, notes and evidence carried forward and compared, so the close continues instead of restarting.
06
Current-tax provision
The provision computed from the same adjustments that drive the return, available to finance during the close rather than after it.
07
PND51 penalty-risk simulator
The half-year estimate tested against the shortfall thresholds before filing, so the exposure is priced while it can still be changed.
08
PND50 mapping and review
Return fields mapped from the computation, with preparer, reviewer and approver stages, period lock and evidence-linked workpapers.
Two engines, never mixed. AI extracts, classifies, detects and explains. A deterministic engine applies the approved formulas and versioned rules.
A language model never calculates a tax position or changes one silently. Click any amount and the chain is there:
Return field→Computation line→Adjustment note→GL transactions→Source document→Legal rule→Approval history
How the platform works
01
Upload
Accounting records and supporting documents in, once.
02
Map
Accounts and documents matched to the tax data model.
03
Adjust
Rules applied; each adjustment recorded with its authority.
04
Review
Preparer, reviewer and approver stages, then period lock.
05
Defend
Evidence room and request tracker for any later enquiry.
Example workflow
A half-year estimate for a non-BOI manufacturer
Illustrative sequence, not a client engagement.
01
The interim trial balance and GL are uploaded; the mapping assistant proposes accounts and flags three it cannot place.
02
Recurring adjustments return from last year with their notes and evidence attached, ready to confirm or revise.
03
A new entertainment expense is classified against the s.65 ter rule that applies, with the limit computed rather than estimated.
04
The Reversal Guardian flags a provision released this period that reversed a prior-year timing adjustment.
05
The estimate is simulated against the shortfall thresholds; the penalty exposure of two forecast scenarios is compared.
06
The reviewer approves and the period locks; the PND51 fields, the workpapers and the evidence are one record.
Outcomes
The close continues
Positions carry forward, so each year starts from the last one rather than from a blank sheet.
Estimation risk priced
Shortfall exposure on the half-year estimate is known before filing, not after assessment.
Positions survive turnover
The reasoning lives in the record, not with the person who prepared it.
Defence is a query
An RD question is answered from the chain behind the number.
Close-time and adjustment-accuracy comparisons to be added once measured with client data
Data security and auditability
Append-only audit trail: approved records are never overwritten, only superseded.
Period lock after approval, with a controlled reopening path that is itself recorded.
Preparer, reviewer and approver separation, and per-client isolation in advisory mode.
Thai and English interface, so the record reads the same to a local reviewer and a group office.
Certifications and independent assurance to be confirmed
Integration and roadmap
Available now: trial balance, GL and document upload with the mapping assistant.
Deferred tax is included as an enterprise preview alongside the current-tax provision.
Next: BOI allocation, multi-entity groups and direct ERP connectors.
Later: direct e-filing — only after the Revenue Department interface is validated. We will not claim it before then.
Named ERP connectors to be confirmed
Run one year of your own accounts through CIT24.
Bring a trial balance and last year's adjustments. We will show the computation, the evidence chain behind each figure, and what the estimate would have cost.
Request a Demonstration