Before you start

A passport, and a cédula de extranjería once you hold a visa, which allows online RUT registration
An honest day-count of time physically in Colombia across any rolling 365-day window, entry and exit days included
Records of worldwide income and assets, including foreign balances and property
For anything involving goods across the border: a Colombian customs agent, engaged before rather than after the first shipment

Step-by-step

1
Track your days from the day you land — and remember the border blurs them
You become a Colombian tax resident on an aggregate 183 days or more within any 365 consecutive days. The window rolls rather than following the calendar year. In Cúcuta the day count is easier to lose than anywhere else in Colombia because short hops across the bridge feel like errands rather than international travel. They are international travel, they are stamped, and they count — which is another reason never to cross by a trocha.
OnlineWho: You, or a Colombian contadorOngoing from arrival
2
Register a free RUT with DIAN
The RUT is your DIAN registration and generates your NIT. With a cédula you can usually do it online through MUISCA; with only a passport, DIAN's Cúcuta office handles it by appointment with a pre-filled Formulario 001 and a passport copy. It is free, and banks in a border department are more likely than most to want it before opening a foreigner's account.
OnlineWho: You, with DIANSame day to about a weekFree
3
Convert thresholds using the correct year's UVT
Nearly every Colombian tax figure is quoted in UVT, republished by DIAN each December for the following year. Filing obligations trigger at 1,400 UVT of gross income, consumption or bank deposits, and 4,500 UVT of gross worldwide assets — a threshold a foreign property or pension pot alone can cross. A return filed this year for last year's income uses last year's UVT.
OnlineWho: You or your contadorAn hour or two
4
Register for municipal ICA if you invoice independently from Cúcuta
The Impuesto de Industria y Comercio is a municipal tax on industrial, commercial and service activity carried on within Cúcuta, charged on gross receipts at a rate per thousand set by activity code, and filed with the municipality's Secretaría de Hacienda rather than DIAN. Salaried employment is outside ICA. Note that the metropolitan area includes Villa del Rosario, Los Patios and others, each a separate municipality — so if your premises are in Villa del Rosario, that is where the ICA return goes.
OnlineWho: You, with the relevant municipal haciendaRegistration once; returns on the municipal calendarRate per thousand of gross receipts, by activity code
5
Treat anything crossing the bridge as customs, not tax
Bringing goods in or out across the frontier engages Colombian customs law, the free-trade-zone regime if you are inside one, and the special provisions that apply to border municipalities under Ley 191 de 1995. Informal cross-border trade is an enormous part of Cúcuta's actual economy and it is not a model a foreign resident should copy. Engage a licensed customs agent before the first movement, not after a seizure.
In personWho: You, with a licensed Colombian customs agentBefore any commercial movement of goods
6
File the declaración de renta between August and October
The tax year is the calendar year and the individual filing window runs roughly mid-August to late October, with your date fixed by the last two digits of your NIT as shown on the RUT, ignoring the verification digit. File and pay through MUISCA. Property owners should also diarise the municipality's annual predial deadlines, which are separate and carry their own early-payment discount.
OnlineWho: You or your contadorAnnual, on your NIT-assigned dateFiling is free; a contador handling a foreigner's return typically charges from COP 400,000 upward

Documents you’ll need

Passport and cédula de extranjería
RUT certificate showing your NIT
Every entry and exit stamp, which is also your evidence of days in and out of the country
Income evidence: contract or invoices, and retención en la fuente certificates
Asset and bank records for the patrimonio declaration, valued at the 31 December exchange rate

Things most newcomers don’t know

In Cúcuta the tax-residency day count is unusually easy to lose, because crossing an international border feels like running an errand.

A trip to San Antonio del Táchira takes less time than crossing Bogotá, so people stop registering it as international travel. But those days are stamped, they leave and re-enter the country, and they bear directly on whether you cross 183 days in a rolling window. Keep the stamps and keep a spreadsheet — and note that a trocha crossing gives you neither, which is the paperwork half of why it is a bad idea.

Source: DIAN residency rules; Migración Colombia entry and exit records

Being a recognised border municipality gives Cúcuta a fuel and customs regime the interior does not have — and it is regulatory, not folklore.

Ley 191 de 1995 provides for special regimes in border zones and Ley 1430 de 2010 lets the Ministerio de Minas y Energía set fuel distribution and tariff schemes for those municipalities specifically. That is a real, published framework rather than local custom — which also means it is varied by resolution and should be read from the current one. It is separate from, and no excuse for, the informal cross-border trade that surrounds it.

Source: Ley 191 de 1995; Ley 1430 de 2010 art. 9; Ministerio de Minas y Energía 2026 resolutions

The metropolitan area is several municipalities, so 'Cúcuta ICA' may not be the tax you owe.

Villa del Rosario, Los Patios, El Zulia, San Cayetano and Puerto Santander are separate municipalities inside the Área Metropolitana, each with its own ICA rates and calendar. Premises just past the boundary — which is common, because the land is cheaper — mean the return goes to a different hacienda. Establish it from the predial or utility bill for the premises.

Source: Colombian municipal ICA rules; Área Metropolitana de Cúcuta member municipalities

Assuming a digital-nomad visa or a foreign employer keeps you outside Colombian tax residency is the most common and most expensive error.

Residency is a physical-presence test and nothing about the visa class or the payer's location changes it. Cúcuta is cheap enough that people stay longer than planned, cross 183 days in a rolling window without noticing, and acquire a worldwide-income filing obligation retrospectively. Count the days from arrival, including the days you flew in and out and every bridge crossing.

Source: DIAN residency rules; Estatuto Tributario art. 10

Common mistakes to avoid

Losing the day count because short trips to Venezuela stop feeling like international travel.
Filing ICA with Cúcuta when the premises are in Villa del Rosario, Los Patios or another metropolitan municipality.
Copying the informal cross-border trade practices around you instead of engaging a licensed customs agent.
Assuming a digital-nomad visa or a foreign employer keeps you outside Colombian tax residency — only staying under 183 days in any rolling 365 does.
Converting thresholds with the wrong year's UVT, which is republished every December.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.