The 100% ITBMS withholding is a stricter mechanism than the 50% withholding: it means the buyer retains the entire ITBMS amount invoiced and pays it directly to the DGI, without transferring anything to the seller for ITBMS. It applies in specific cases defined by law and DGI resolutions. Knowing when it applies is critical to avoid errors that can generate tax contingencies worth thousands of dollars.
Important: cases subject to 100% withholding are governed by current regulations. Before applying (or not applying) this mechanism in real transactions, verify with your accountant and the latest DGI resolution.
How does it differ from the 50% withholding?
The difference is simple but critical:
| Concept | 50% Withholding | 100% Withholding |
|---|---|---|
| Who withholds | Buyer (agent) | Buyer |
| Amount withheld | 50% of ITBMS | 100% of ITBMS |
| Who pays ITBMS to the government | Buyer (50%) + seller (50% on their Form 430) | Buyer (100%) |
| Seller receives ITBMS | Yes (50% of invoiced) | No, none of the ITBMS |
| Typical case | Purchases from domestic suppliers | Purchases from non-domiciled suppliers, specific professional services |
Under 100% withholding, the seller does not collect ITBMS in practice; they invoice it for formal purposes but the net payment they receive is only the subtotal. The full tax obligation falls on the buyer.
For a detailed look at the 50% withholding, see our dedicated guide on 50% withholding.
Typical cases of 100% withholding
1. Purchases from suppliers not domiciled in Panama
When a Panamanian company acquires services from a foreign supplier that has no tax presence in Panama, it must self-withhold 100% of the ITBMS. Examples:
- Software-as-a-Service (SaaS) subscriptions from international companies (Microsoft 365, Google Workspace, Adobe Creative Cloud).
- Consulting services provided by foreign consultants.
- Software licenses acquired from developers outside Panama.
- Digital marketing services (Google Ads, Meta Ads) when contracted through international accounts.
Example: your company purchases an annual SaaS subscription for B/.5,000.00 from a supplier in the United States.
| Concept | Amount |
|---|---|
| Service cost | B/.5,000.00 |
| ITBMS 7% (self-withheld) | B/.350.00 |
| Total to pay to the government | B/.350.00 |
| Payment to foreign supplier | B/.5,000.00 |
Your company pays B/.5,000 to the foreign supplier and B/.350 directly to the DGI as 100% withholding. The company can use that ITBMS as a tax credit on its Form 430 (as long as the service is taxable and deductible for your activity).
2. Specific professional services
The DGI has designated by resolution 100% withholding on certain professional services rendered by individuals:
- Legal, accounting, and auditing services in specific cases.
- Notary services.
- Other independent professionals as specified by the current resolution.
Always verify the current resolution before applying — the list is updated periodically.
3. Cases by express DGI designation
The DGI may designate specific transactions or specific suppliers subject to 100% withholding by resolution. This typically occurs when:
- There is a history of systematic tax evasion.
- It involves sectors with a high informality risk.
- The tax authority identifies specific contingencies.
How to invoice when 100% withholding applies
The seller issues the electronic invoice clearly indicating:
- Subtotal for the goods or services.
- ITBMS calculated (at 7%, 10%, or 15% as applicable).
- Express statement: "Subject to 100% ITBMS withholding by the buyer."
- Total invoiced.
- Total payable to the seller: the subtotal only.
The buyer issues the 100% withholding certificate and deposits the ITBMS to the government using the corresponding form within the deadline (typically 15 calendar days of the following month).
Implications for companies with foreign suppliers
Panamanian companies that heavily consume SaaS, licenses, and international digital services have self-withholding obligations that are frequently underestimated:
- Every Microsoft 365, Google Workspace, Adobe, Slack, AWS, etc. subscription must have the 7% self-withheld on the cost.
- The self-withheld ITBMS becomes a tax credit if the services are deductible.
- Failure to self-withhold = tax contingency that grows with each monthly or annual renewal.
Cumulative example: a company with B/.50,000 annually in international SaaS has B/.3,500 per year in self-witholdable ITBMS. If they have gone three years without self-withholding, the contingency (plus interest and penalties) can exceed B/.12,000.
Common mistakes with 100% withholding
- Not self-withholding on foreign SaaS subscriptions: out of ignorance, many companies treat these as expenses with no tax component.
- Applying 50% when 100% is required: especially common with professional services designated by resolution.
- Not claiming the corresponding tax credit: the self-withheld ITBMS is deductible if the expense is deductible. Forgetting to record it as a credit on the Form 430 = paying more than owed.
- Paying the supplier the full amount including ITBMS: under 100% withholding, the seller only receives the subtotal. Overpaying requires recovering the excess.
- Not keeping documentary evidence: the self-withheld and declared ITBMS must be supported by the supplier's invoice, the proof of payment to the government, and the calculation performed.
How each party files
The seller (when 100% is withheld from them)
On their Form 430:
- Reports the transaction as taxable (invoices the ITBMS).
- Applies the full 100% withholding as a credit acknowledged by the buyer.
- The net payable for that transaction is B/.0 because the buyer assumed the entire obligation.
The buyer (who withholds 100%)
In addition to their normal Form 430:
- Reports the 100% withholdings made during the month.
- Pays the withheld amount to the government within the applicable deadlines.
- Claims as a tax credit on their Form 430 the ITBMS paid to the government (as long as the expense is deductible).
How cifraHQ automates 100% withholding
cifraHQ automatically identifies non-domiciled suppliers (based on country of origin and RUC validation), generates the self-withholding of 100% of the ITBMS upon receiving the foreign supplier's invoice, issues the withholding certificate required by the DGI, records the withheld ITBMS as a tax credit on the next Form 430, and consolidates monthly withholding reports (50% and 100%) for timely submission to the DGI.
Does your company consume international SaaS or work with foreign suppliers? Request a demo and see how cifraHQ eliminates the risk of failing to self-withhold.
Official resources
- Dirección General de Ingresos (DGI) — withholding agent resolutions
- Form 430 — Monthly ITBMS Declaration
- 50% ITBMS Withholding — differences from the 100%
This article is informational and does not constitute tax advice. Rates, deadlines, and cases subject to withholding may change; always verify with your accountant or tax advisor.