If there is one tax obligation no Dominican business owner can ignore, it is the Impuesto Sobre la Renta (ISR — Income Tax). And yet, year after year, hundreds of companies and individuals file their returns late, accumulating surcharges that could have been avoided with simple tax calendar planning.
This guide provides the key ISR deadlines for 2026, the logic behind advance payments, and what happens when you fail to comply with the DGII on time.
The difference between IR-1 and IR-2: do not confuse the forms
Income tax in the Dominican Republic is declared using two different forms depending on who the taxpayer is:
The IR-1 is the form for individuals who generate employment income, professional fees, rental income, or any other taxable income. It includes employees with income above the exempt minimum, independent professionals, and individual business owners.
The IR-2 is the form for legal entities: corporations, SRLs, individual limited liability companies, and any other entity with its own legal personality. This is the form used by most formally incorporated companies.
Confusing which form applies to you — or delegating this decision without supervision — is an error that can generate complications with the DGII.
Filing deadlines for 2026
IR-2 (legal entities)
The ordinary fiscal year in the Dominican Republic closes on December 31 of each year. The IR-2 return must be filed within the first 120 days of the year following the close of the fiscal period.
For fiscal year 2025 (January-December 2025), the filing deadline is April 28, 2026.
Companies with fiscal years ending other than December 31 have different deadlines, also calculated as 120 days from their closing date.
IR-1 (individuals)
Individuals have a shorter deadline. The IR-1 return for fiscal year 2025 must be filed no later than March 31, 2026.
Advance payments: the obligation many forget
One of the areas of greatest confusion — and greatest fine generation — is ISR advance payments. Companies do not pay income tax once a year when filing the return. During the current year, they must make twelve monthly payments equivalent to one-twelfth of the prior year's tax.
These payments are made monthly before the 20th of each month. If your company had an ISR of RD$1,200,000 in 2024, you must pay RD$100,000 monthly during 2025, regardless of whether you earn more or less in 2025.
When you file the IR-2 in April 2026, those advance payments will be credited against the total calculated tax. If the payments exceeded the actual tax, you have a credit balance; if they fell short, you pay the difference.
The critical error: many companies omit advance payments because "the accountant handles it" or because cash flow is tight. Each omitted payment generates automatic 10% monthly late charges, which accumulate until the return is filed.
Tax reconciliation: the step that makes the difference
The IR-2 tax base is not simply accounting profit. It requires reconciliation between financial and fiscal profit, adjusting for:
- Non-deductible expenses (fines, donations above limits, excess representation)
- Exempt income
- Tax vs. accounting depreciation
- Prior year losses carried forward (up to 5 years)
This reconciliation must be done correctly because it is one of the first points the DGII reviews in an audit. An error in the reconciliation can mean incorrectly calculated ISR and, therefore, an omitted tax.
Penalties for late filing or incomplete payment
The DGII applies two types of penalties when deadlines are not met:
Late filing penalty: equivalent to 10% of the determined tax, for each month or fraction of a month of delay, with a maximum of 100%.
Late payment charges: 10% monthly on the unpaid amount. This charge has no percentage ceiling; it accumulates month by month until the debt is paid.
Additionally, the DGII can apply "adjustment" surcharges when it determines that the filed return intentionally underreported income, which opens the door to additional investigations.
Planning strategies to avoid surprises
Tax planning is not evasion; it is the intelligent use of tools the law provides. Some practices you can implement:
- Provision monthly for estimated ISR in your accounting
- Review advance payments in July to adjust if the year is going better or worse than the previous one
- Use permitted deductions (education expenses, mortgage, health for IR-1; fixed asset investments, R&D for IR-2) before the period closes
- Always file before the deadline, even if you do not have the full tax amount — the late filing penalty is separate from late charges and can be avoided
How we can help
At Effort Business Consulting we manage the preparation and filing of IR-1 and IR-2 returns for individuals and legal entities, including tax reconciliation, advance payment calculations, and representation before the DGII in case of notifications or audits.
Do not wait until the deadline approaches. Contact us today to schedule the preparation of your 2026 tax return.
