Most people researching Paraguay focus on what gets taxed and what doesn’t. Few think about what happens after — the part where, every month, a portal expects you to log in and tell it what you did. Then the first month rolls around, the deadline lands, and the new resident realises the system has its own rhythm that nobody walked them through.

The system itself is fine. Paraguay’s monthly filing process is predictable, mostly automated once you’ve done it once, and quick if you know where to click. It is just opaque from the outside. This post is the walkthrough we’d give a client on day one of their RUC, before the first deadline catches them off guard.

What Marangatu is

Marangatu is the online tax portal at marangatu.set.gov.py, run by DNIT (Dirección Nacional de Ingresos Tributarios), the consolidated tax-and-customs authority created in 2023 under Ley 7143/2023 by merging the former SET with the customs agency. It is where every registered Paraguayan taxpayer files monthly returns, declares income, manages IVA credits and debits, pays multas, and views their entire tax history with the state. The name itself comes from the Guaraní word marangatú — broadly meaning “good” or “virtuous” — which is on-the-nose for a tax portal and fits Paraguay’s bilingual character.

If you have a RUC, you have a Marangatu account. Login is by RUC number plus a password you set when your registration was processed. The interface is functional rather than friendly — it looks like a government portal because it is one — but it does what it needs to do, and once you know the three or four screens you actually visit, the rest is noise.

The portal is the only practical channel for monthly filing. There is no “we’ll call it in” alternative for routine returns. Either you log in or your accountant logs in on your behalf with delegated access. Delegation is formal — DNIT supports authorized representatives who can file on behalf of a taxpayer, and the authorization is registered against your RUC. This is how accounting services like ours operate: with explicit, documented permission to file, not informal access-sharing.

A few practical notes on the portal itself. It runs reliably during the first half of the deadline window each month and slows down measurably during the last day or two — the load curve is exactly what you’d expect for a system where the country files in waves. It also has a small habit of logging users out for inactivity, which is mostly a non-issue if you finish a session in one sitting but bites people who walk away mid-form. Save what you’ve entered, then come back; don’t try to leave a half-completed return open.

The cycle: declare last month, in the following month

Paraguay’s monthly tax filing covers the previous month’s activity, declared in the following month. So your April activity is filed in May. Your May activity is filed in June. The deadline is not a single date — it is staggered across the month, with each taxpayer’s filing day fixed by the last digit of their RUC.

The staggering exists so the portal isn’t slammed by the entire country on the same date. Each ending digit gets its own assigned day, spread from the 7th through the 25th of the month. The rule is published by DNIT as the calendario perpetuo — a perpetual calendar that holds the same day-by-day mapping every month, year after year:

Last digit of the RUC	Filing day
0	7th
1	9th
2	11th
3	13th
4	15th
5	17th
6	19th
7	21st
8	23rd
9	25th

If your filing day falls on a weekend or a Paraguayan public holiday, it moves to the next business day — without shifting the other days. The rule is stable; the only adjustment from month to month is the holiday bump.

One detail that catches new arrivals out: the digit DNIT uses for filing is the last digit of the cédula portion of your RUC — that is, the digit immediately before the verification digit. Your RUC is your cédula number plus a dash plus a verification digit (so something like 1234567-8). The filing day is keyed to the 7 in that example, not the 8.

Separate local thing worth knowing: when you’re making a purchase in Paraguay and the cashier asks for “el guion” — Spanish for “the hyphen / dash” — they mean the digit after the dash (the verification digit, the 8 in 1234567-8). That’s a different digit from the one that drives your monthly filing day. Both are worth knowing by heart from day one — the digit before the dash for DNIT, the guion after the dash for checkout counters.

You can file early. You cannot file late without a multa.

Filing early is the simple defense against most of the things that go wrong. The portal is responsive, the data is rarely complicated, and the work fits into a coffee break for a typical RUC holder with foreign-source-only activity and a clean zero. The only reason to push to the last day is procrastination — and Marangatu, like every government portal, becomes meaningfully slower in the final hours of any deadline window.

A working rhythm we encourage clients to adopt: pick the first business day of every month as a personal “filing day,” do the previous month’s return, and forget about it. The deadline becomes a backstop you never need rather than a date you race toward.

Zero-income months — yes, you still file

This is the part that catches new RUC holders. If you had no economic activity last month — no facturas issued, no income earned, no transactions to report — you still file. You enter zero. You submit. The portal records the zero return.

Marangatu makes the zero filing quick once you know the trick: enter 0 in the first income field and tab to the next one, and the remaining fields cascade to zero on their own. Confirm, submit, done. The first time through the form is the slow time — you’re reading what each line is for; after that, a zero month is a fast visit.

Zero filing is not optional. The obligation to file is tied to having an active RUC, not to having had income. Skipping a zero-income month produces the same multa as skipping a month with activity, and the portal will tell you about it on the day after your deadline.

This is the single most common mistake we see in clients who try to handle the filing themselves and then drift. Three months of “I had no income, why would I file” later, and they have three small multas waiting. The fix is fast — but the fix exists, which means the original step was needed.

How long payments take to reflect

If you owe tax for the period — IRP for the year, IVA on a positive position, or a multa — Marangatu will generate a payment slip you can settle through Paraguayan banks, several payment networks, or directly via debit on a Paraguayan account.

Payments usually reflect on the same business day. Occasionally they take up to one business day to clear and update the portal status. If you’re paying close to a deadline, give yourself a buffer — the deadline is the date the filing and payment must both be in, not the date the wire is sent. We tell clients to settle at least one business day ahead of their assigned digit-day for this reason.

For clients who are abroad on the deadline, paying through a Paraguayan banking app from another country is possible but sometimes flaky depending on the bank. Our service includes bill pay so you don’t have to fight a foreign IP block at midnight to clear a multa.

Multas: what triggers them, what they cost

A multa is the Paraguayan term for a small administrative fine. The ones we see most often come from:

Late filing of a monthly return — even by one day, even on a zero-income month.
Late payment of tax actually owed — separate from the late-filing multa; a late filing with a balance due triggers both.
Filing errors that are corrected late — for example, an amended return submitted after the original deadline window has closed.
Lapsed or unupdated registration data — less common, more administrative.

The amounts are set in jornales (daily-wage units) per the law, and shift as the jornal updates each year. They are meaningful but not catastrophic on a single missed filing; they compound if you let them sit. They are paid through Marangatu directly: the portal generates the slip, you pay it, the entry clears.

If you’re abroad and a multa appears, you can pay it remotely through Paraguayan banking channels — or, if you’re a Sweet Home Paraguay accounting client, we settle it from the bill-pay function so you don’t have to stop what you’re doing. Either way, ignoring a multa is the worst path; it does not go away on its own and it accumulates interest.

The IVA overlay

Most expats who hold a RUC are also enrolled for IVA — the value-added tax, Paraguay’s VAT — because the moment you issue a factura at the standard rate, IVA is part of the transaction. IVA filing happens monthly, alongside (or as part of) the same Marangatu submission cycle.

The IVA filing is a credits-and-debits declaration. You report the IVA on the facturas you issued (debits) and the IVA on the qualifying purchases you made (credits). The difference is what you owe — or, if your credits exceed your debits, what carries forward to the next month.

Paraguay’s standard IVA rate is 10%, with a reduced 5% rate on certain goods and services (notably staple foods, real-estate transactions of certain types, and a few specific categories). Most professional services and most general commerce sit at the 10% rate. The factura format you issue records which rate applies on each line, and the totals roll up into the monthly IVA return automatically once the facturas are entered into the system.

For most expat RUCs with foreign clients, IVA positions tend to be small or neutral month to month, because foreign-source invoicing under the right structure does not generate Paraguayan IVA debits. Local invoicing, local purchases, and any genuinely Paraguay-source activity is what fills in the IVA picture. The mechanics of which invoices generate IVA at which rates is the kind of detail that benefits from a local accountant once activity picks up — particularly when you start working with mixed-source revenue or buying assets locally that you’d like to claim as IVA credits.

The practical takeaway: if you have a RUC, you very likely have an IVA filing each month too. Don’t treat them as separate — they’re a single monthly visit to Marangatu, just with two forms attached.

There is one IVA scenario worth flagging early: if you start issuing electronic facturas through Paraguay’s e-invoicing system (SIFEN), the data flows into Marangatu directly, and your IVA return becomes mostly a confirmation step rather than a data-entry step. E-invoicing isn’t mandatory for every RUC at every activity level, but it’s increasingly the default for businesses, and for clients who issue volume it changes the monthly burden meaningfully. Worth knowing exists; not worth obsessing over until your activity actually demands it.

What this looks like with help

Many of our clients use the Sweet Home Paraguay monthly accounting subscription specifically because they don’t want to think about any of the above. They send us their facturas (or note they had no activity), and the monthly Marangatu filing — IRP-related declarations, IVA, the zero returns when applicable — is done before the deadline window opens. If a multa ever appears, we settle it from the bill-pay line and you find out about it on the monthly summary, not on a midnight panic.

That isn’t a pitch as much as a description. We’ll know your name. We handle the unglamorous parts. We get back to you when you reach out. The point of the subscription is that the cycle becomes invisible to the person who hired it — which is the point of hiring it.

What to do next

If you have a RUC and haven’t yet built the monthly cycle into your life, our accounting service takes the whole filing — Marangatu access, monthly returns, IVA, multas, the calendar — off your plate. Hand in your receipts, we do the rest. If you don’t yet have a RUC and you’re trying to decide whether to register, start with getting a RUC in Paraguay — the filing cycle in this post is one of the commitments that comes with it, and it’s worth seeing the whole picture before signing on.