The decision about what to do with your UK home is the most significant financial choice in the entire process, and it deserves careful thought rather than a default decision made in the rush of planning a move.

Keeping your UK property and letting it as a rental is the common choice and has many advantages. It provides ongoing passive income in pounds, maintains a UK asset base, and preserves the option of returning to the UK without needing to buy again. The income counts toward your NLV financial threshold. But complications are real- as a Spanish tax resident you must declare UK rental income in Spain and pay Spanish tax on it, with credit for any UK tax already paid. You also remain a UK landlord with all the legal responsibilities that entails, including compliance with increasingly demanding rental regulations. A UK-based letting agent who manages the property fully is almost essential unless you have trusted family or friends who can handle issues locally.

Selling before or shortly after moving gives you a clean break, releases capital that can fund your life in Spain, and removes the ongoing responsibilities of being a remote landlord. If the property has increased in value since you bought it, UK capital gains tax on the gain may apply- the timing of the sale relative to your UK non-residency status can affect your CGT position, and taking advice from a UK tax specialist before deciding when to sell is worthwhile. Once you are a Spanish tax resident, any gain on a UK property sale must also be declared in Spain, though the double tax treaty ensures you are not taxed in full in both countries simultaneously.

Leaving a UK property vacant while abroad is the least advisable option. Empty properties attract higher council tax in many UK councils, insurance becomes more difficult and expensive, and maintenance issues can go unnoticed. If you are uncertain about your long-term plans and do not want to sell or rent, having a trusted person check on the property regularly is the minimum sensible arrangement.