Before you start

A passport, plus a cédula de extranjería (foreigner ID) once you hold a visa — ideal for online RUT registration
A rough day-count of time physically spent in Colombia across any 365-day window (entry and exit days both count)
Records of worldwide income and assets (foreign salary, freelance/remote earnings, bank balances, property) for the tax year
An email address for DIAN correspondence and access to the DIAN MUISCA portal (muisca.dian.gov.co)

Step-by-step

1
Work out whether you are a tax resident (the 183-day test)
You become a Colombian tax resident if you spend an aggregate 183 days or more in the country within any 365 consecutive days — the window is rolling, not the calendar year, and residency lands in the year the 183rd day falls. Residents are taxed on worldwide income; non-residents only on Colombian-source income (a flat 35%). Crucially, a Digital Nomad Visa or remote work for a foreign company does NOT exempt you: if you cross 183 days, your foreign salary and freelance income become declarable in Colombia.
OnlineWho: You (or a Colombian tax accountant / contador)A few hours to assess; ongoing day-tracking
2
Register a RUT (your tax ID) with the DIAN
The RUT (Registro Único Tributario) is your registration with the DIAN and generates your NIT (tax ID number). With a cédula de extranjería you can often register online via the DIAN MUISCA portal; with only a passport you typically book a non-presencial (remote) or in-person appointment, email a pre-filled Formulario 001 plus passport copy, and receive the stamped RUT back by email. The RUT is free.
OnlineWho: You, with the DIANSame day to ~1 week depending on appointmentFree
3
Understand UVT and the filing thresholds
Almost every Colombian tax figure is quoted in UVT (Unidad de Valor Tributario), a unit DIAN re-sets yearly for inflation — the 2026 UVT is COP 52,374 (the 2025 UVT used for returns filed in 2026 was COP 49,799). You must file a declaración de renta if in the tax year your gross income, total consumption/credit-card spend, or bank deposits each reached 1,400 UVT (about COP 70 million / ~US$17,000), or your gross assets (patrimonio, worldwide for residents) reached 4,500 UVT (about COP 224 million / ~US$56,000). The threshold is lower than most newcomers expect.
OnlineWho: You (or your contador)1-2 hours to map your numbers
4
Handle withholding (employees) or advance payments (freelancers)
Salaried employees of Colombian entities have tax withheld at source via retención en la fuente, which is credited against the final return. Self-employed people and freelancers generally have no withholding, so you track income yourself and settle through the annual return (with possible advance/anticipo payments). Worldwide income is reported, but residents can credit foreign income tax already paid abroad against the Colombian liability to relieve double taxation.
Via employerWho: Employer (withholding) or you (freelance)Ongoing through the tax year
5
File the annual declaración de renta (Aug-Oct)
The tax year is the calendar year. For 2026 the individual filing window runs roughly 12 August to 26 October, with your specific due date fixed by the last two digits of your NIT (as shown on the RUT, ignoring the verification digit). File and pay through the DIAN MUISCA portal; missing your dated deadline triggers automatic late-filing penalties and interest.
OnlineWho: You (or your contador)Deadline assigned by NIT digits; file once per yearFiling is free; tax due varies; accountant ~COP 400k-several million

Documents you’ll need

Passport and cédula de extranjería (foreigner ID)
RUT certificate showing your NIT (Registro Único Tributario)
Income evidence: foreign and Colombian salary, freelance/remote invoices, retención en la fuente certificates
Asset and bank records for the patrimonio declaration (worldwide for residents, valued at the Dec 31 exchange rate)

Things most newcomers don’t know

The 183-day rule makes you a worldwide-income tax resident even on a Digital Nomad Visa or working remotely for a foreign employer — the visa does not shield you. Stay under 183 days in any 365-day window and you remain a non-resident, taxed only on Colombian-source income (which most remote earners have none of).

This is the single most misunderstood point for nomads: residency is driven purely by days present, not by visa type or where you are paid, so lingering past 183 days quietly pulls your global income into Colombia's net.

Source: PwC Worldwide Tax Summaries — Colombia, Individual Residence (2026)

Colombia denominates nearly every tax figure in UVT (Unidad de Valor Tributario), a peso unit DIAN resets yearly for inflation. The 2026 UVT is COP 52,374; returns filed in 2026 for 2025 income use the 2025 UVT of COP 49,799. Multiply the UVT count by the right year's value to convert any threshold or bracket into pesos.

Because thresholds (e.g. the 1,400-UVT filing trigger) and brackets are fixed in UVT not pesos, using the wrong year's UVT — or assuming the numbers are static — produces materially wrong calculations.

Source: DIAN Resolución 000238 of 15-Dec-2025 (UVT 2026)

There is no comprehensive income-tax treaty between the United States and Colombia. Americans who become Colombian tax residents must still file with the IRS on the same worldwide income and rely on the Foreign Tax Credit (Form 1116) or Foreign Earned Income Exclusion to avoid double taxation — there is no treaty to fall back on.

Many US citizens assume a treaty smooths things over; without one, both countries can tax the same income and you must coordinate credits manually, making professional advice valuable.

Source: Taxes for Expats / Mama in Medellín — US expats in Colombia (2026)

You cannot file — and often cannot bank or contract formally — without a RUT, and it generates the NIT whose last two digits set your filing deadline. The RUT itself is free from DIAN, and a cédula de extranjería lets you register online rather than queuing for an appointment.

The RUT is the gateway to the whole system: no RUT means no NIT, no deadline slot, and no legal way to submit the declaración de renta or claim foreign tax credits.

Source: DIAN MUISCA / expatgroup RUT guide (2026)

Common mistakes to avoid

Assuming the Digital Nomad Visa (or being paid by a foreign company) exempts you from tax residency — it does not; 183+ days makes you a worldwide-income resident.
Lingering past 183 days unaware that entry and exit days both count and the 365-day window is rolling, then being surprised your foreign income is now declarable.
US citizens forgetting they must still file with the IRS — and that there is no US-Colombia tax treaty, so double-tax relief must be claimed via foreign tax credits.
Missing your NIT-digit filing deadline in the Aug-Oct window (or never registering a RUT), which triggers automatic late-filing penalties and interest.