Monotributo 2026: new ARCA categories and a calculator for SMBs

One-minute summary

On January 1, 2026, ARCA —the renamed AFIP— raised monotributo gross-revenue caps by about 14.3% to track CPI. For 1.8 million Argentine micro-businesses, that means recalculating category against the trailing 12 months and deciding whether to stay in monotributo or move to the regular tax regime. A calculator is not a convenience: it's how you avoid showing up late to the August recategorization and eating a penalty.

• New scales live from January 1, 2026 — 14.3% CPI indexation for the October 2024 – October 2025 window (ARCA general resolution, published the first week of January).
• Recategorization No. 1 — January–February 2026, based on the trailing 12 months of gross revenue.
• Recategorization No. 2 — August 2026, mandatory for every monotributista.
• Categories A through H — separate scales for sale of goods and for services. Past the H cap, you fall into the regular regime (VAT + income tax).
• Unified Monotributo in CABA — from January 1, 2026, one combined payment covers the national component and provincial gross-receipts tax via AGIP.
• Penalties — up to 50% of the gap between categories for the period out of compliance; up to 10x the amount when revenue is hidden.

What changed between 2024 and 2026

In July 2024 Congress passed Law 27.743 (Ley Bases). Among dozens of provisions, three structural changes to monotributo set the 2026 context:

1. Caps roughly doubled — the gross-revenue limit for category H is close to twice its 2023 level, with the rest of the categories scaled in proportion.
2. Semi-annual recategorization — four windows per year became two: January and August.
3. Automatic CPI indexation — parameters update once a year by accumulated CPI without a separate decree. That ended the classic Argentine situation of frozen brackets through six months of triple-digit inflation.

In December 2024 the agency issued General Resolution 5616/2024, which set the 2025 parameters and tightened the requirement that monotributistas issue electronic C-class invoices. In December 2025 ARCA published the new resolution applying 14.3% indexation for 2026.

The agency was also renamed. In October 2024, Decree 953/2024 turned AFIP into ARCA (Agencia de Recaudación y Control Aduanero). The regulations and powers carried over, but the portal, forms, and branding were rebuilt. Some old afip.gob.ar URLs redirect to arca.gob.ar and argentina.gob.ar/arca, but not all of them: that has already broken integrations that hardcoded the host.

CABA is a separate case. Starting January 1, 2026, the Unified Monotributo runs as a joint scheme between ARCA and AGIP (the Buenos Aires city revenue agency). Monotributistas with fiscal residence in CABA now pay the national component and provincial gross-receipts tax in a single transaction; ARCA distributes the funds. Similar pilots are under discussion in Córdoba and Mendoza, but as of May 2026 neither is live.

How to calculate your monotributo category in 2026

The calculator does not estimate tax: it tests your activity against four parameters that ARCA checks in parallel. If any one of the four exceeds the limit, you move up —even if the other three are comfortable.

#1. Gross revenue for the last 12 months

Twelve rolling months from the recategorization date, net of VAT. If you invoice through multiple tax IDs that share the same beneficial owner, sum them: ARCA applies the «economic group» concept (see the restaurant case below). A common mistake is loading revenue with VAT included —the category gets inflated and you fool yourself.

#2. Premises area (m²)

Only applies to sale of goods. If your premises exceed the m² limit for your category, you move up regardless of revenue. That makes sense for a small storefront with a large warehouse: floor area reveals scale that revenue hides.

#3. Electricity consumed (annual kWh)

Also for certain sale-of-goods activities. If trailing 12-month consumption crosses the limit, you jump categories. Edenor, Edesur, or EPEC bills are what ARCA can request for cross-checking.

#4. Rent accrued

If you work from a leased space, total rent accrued in the trailing 12 months counts as the fourth parameter. ARCA cross-references information that landlords already report under the reporting regime: under-declaring lights up the other side.

How the 2026 categories are structured

ARCA kept the A–H scale for sale of goods and the A–H scale for services. The caps are different: goods sit higher because the regime accounts for thinner margins.

The monthly payment combines three components:

• Integrated tax — replaces VAT and income tax for the monotributista (progressive by category).
• Retirement contribution (SIPA) — flat for A–D, progressive from E.
• Health-coverage contribution — flat across all categories; family add-ons are optional.

All three components rose 14.3% in 2026. In category H, services pay roughly twice the goods payment —a ratio that has held since 2018. Exact figures appear in ARCA's yearly resolution, published the first week of January.

Unified Monotributo CABA: the fourth component

If your fiscal residence is in CABA, a provincial gross-receipts component is added. Before 2026 you paid that separately to AGIP; now it's rolled into the ARCA monthly. More convenient operationally, but it complicates disputes: when there is an error, ARCA debits both components at once and the appeal runs through two agencies.

The calculator algorithm

A useful calculator runs a short decision tree:

1. Activity: services, sale of goods, or both?
2. Gross revenue for the last 12 months (net of VAT).
3. Fiscal jurisdiction: CABA or another province?
4. Premises area (m²) and electricity consumption (annual kWh).
5. Rent accrued over 12 months.
6. Number of employees (0, 1, 2, or 3).

Outputs: category, estimated monthly payment, next recategorization date, and a red flag if revenue is within 15% of the H cap. For fine-tuning, use an accountant; to get 90 days of warning, the calculator is enough. If you want a continuous, non-manual process, look at our work on Odoo implementations in Argentina.

When the calculator works and when it falls short

The calculator runs cleanly if you have one activity (services or goods) in one jurisdiction, you stay under the H cap on every parameter, and you have between zero and three employees with no special regimes (Promoted Monotributo, Social Inclusion).

Manual adjustment is needed when:

• Multi-jurisdiction: you invoice in two or more provinces and apply the Multilateral Agreement for gross-receipts tax. The calculator gives the national component; provincial tax is allocated by Multilateral coefficients.
• Mixed activity: you provide services and sell goods in parallel. Total revenue is the sum; the category is set by the scale with the tighter cap.
• Leased premises: add accrued rent as the fourth parameter. Landlords already report it to ARCA under the reporting regime.

The calculator is not useful if:

• You crossed the H cap: you fall into the regular regime starting the month of the excess. You register VAT and income tax through the ARCA portal.
• Your activity is in Annex I of Law 27.743: financial intermediation, casinos, commercial imports, real-estate leasing above the annual threshold, and so on.
• You have more than three employees: not even a micro-business fits monotributo. You move to the regular regime with employer contributions.

Five common errors when recategorizing

Error 1 — loading revenue with VAT included. Monotributo works on gross revenue net of VAT. If your spreadsheet shows totals with VAT, the category is artificially high. It happens often to people who also issue A-class invoices through a parallel VAT-registered entity.

Error 2 — forgetting accrued rent. If you rent out a property in parallel with monotributo, those rents add to gross revenue. ARCA sees both sides of the transaction (landlord and tenant report independently), making it the easiest cross-check to trigger an automatic recategorization.

Error 3 — recategorizing late. The January–February and August windows close on the last business day. Filing in March or September triggers a 50% penalty on the bracket gap for the entire out-of-compliance period. ARCA matches the invoices reported through Comprobantes en Línea against the declared category: since electronic C-class invoices are mandatory under RG 5616/2024, the gap is impossible to hide.

Error 4 — wrong activity classification. Services and sale of goods have different scales. A restaurant that registers as «food sales» instead of «restaurant services» gets a more favorable scale; on audit, ARCA reclassifies and recalculates up to five years back, with penalties.

Error 5 — ignoring Unified Monotributo CABA. If you keep paying gross-receipts tax to AGIP alongside national monotributo, you risk a duplicate payment and, worse, a tax-ID block when ARCA and AGIP reconcile.

Case study: three restaurants in Palermo, Buenos Aires

Setup. A three-restaurant group in Palermo (CABA) with combined revenue of ARS 280 million in 2025. The owner was registered as a monotributista in category H services. The external accountant summed each restaurant's revenue in Excel per tax ID (one per location) and assumed the H cap was not at risk «because each CUIT is a separate taxpayer.»

Problem. In March 2026, an ARCA audit found that the three tax IDs belonged to one economic group through their shared beneficial owner. Under the economic-group concept, revenues are summed: the combined total was 1.8x the H cap. ARCA voided the monotributo status retroactively to January 2025 and recalculated everything under the regular regime.

Outcome. About ARS 18.5 million in penalties (50% of the VAT and income tax not collected over 14 months), plus interest at the BNA rate. All three tax IDs were suspended for electronic C-class invoicing; the operator had to register them as VAT-responsible entities on short notice and switch to A-class invoices.

Fix. We deployed Odoo Community with the l10n_ar module and a monthly «recategorization projection» report: the system sums gross revenue per economic group and alerts 90 days before approaching the H cap. In parallel, a monthly retainer with the accountant validates the calculation against the ARCA web service. The group now operates under the regular regime with A-class invoices fully integrated in Odoo. To check your own setup before a similar event hits, see our Odoo implementation audit.

The auditor did not ask whether there was intent to evade; she asked whether the system could detect the tax-ID overlap. The answer was no —and that was enough for the penalty.

Download the Monotributo 2026 calculator

The Excel covers all four ARCA parameters, the 2026 service and goods scales, Unified Monotributo CABA, an August recategorization projection, and an automatic alert when you sit within 15% of the H cap. Leave your email and I'll send the file, a short recategorization checklist, and an email template you can forward to your accountant.

Download the Monotributo 2026 calculator →

Next step

The calculator is a point-in-time check. Real savings come from a system that tracks revenue in real time and warns you 90 days before the H cap or before a misclassification triggers an audit. If you already run on Odoo, audit it before the next window: Odoo in Argentina, ARCA and Unified Monotributo CABA integration, audit of existing setups, and implementation from scratch.

Every two weeks we send Pulso Odoo LATAM: one email on compliance, e-invoicing, and automation for LATAM SMBs. No filler.

Frequently asked questions