A property abroad is treated as a separate income source, reported separately, and converted to sterling. Everything else tenancies, expenses, documents works the way it does for a UK property.
Steps For Adding The Foreign Property
Open Switch Profile & Income Source, expand your workspace, and select your foreign source under Income Sources. If you don't have one yet, click + Add New and create it as a Foreign Property source.

Check the green tick has moved to it. Everything you create from here properties, tenancies, transactions.
Go to My Property → Properties → Add property. The form is the same one you'd use for a UK property.
Find your property. Type the address or place name and pick it from the results the search handles overseas addresses as u can see in the image.

Fill in the basics. Property name, property type, units and letting use.
Ownership & profit share. Apply an existing portfolio, or add owners and their percentages. Shares must total exactly 100%.

Click Add property.
Currency
Your accounts and everything sent to HMRC are in sterling. RentalBux converts foreign-currency transactions as they are recorded, and shows both the original amount and the sterling figure on the transaction so the conversion is always visible.
Check first: Which exchange rate is acceptable transaction-date rate, monthly average, or HMRC’s published rate is a tax question, and HMRC publishes its own monthly and annual rates on gov.uk.
What HMRC Receives
Foreign property income is reported on the foreign pages (SA106), separately from UK property. That means a separate set of quarterly updates for the foreign source. Both sets are prepared in RentalBux under one subscription.
Worked Example
An apartment in Alicante lets for €900.00 a month. Each rent receipt is recorded in euros and carried into the accounts in sterling at the rate applied on the transaction date, with both figures visible on the record. Community fees, local taxes and insurance are recorded the same way. At the quarter end, the foreign source has its own totals, entirely separate from the UK flats in the same account.
Keeping The Evidence
Foreign lettings generate paperwork in another language and often another format. Attach it anyway the community fee statement, the local tax demand, the agent’s account. If HMRC or your accountant asks how a figure was arrived at, the original document plus the conversion shown on the transaction is the whole answer.
Non-Resident Landlords
If you live outside the UK and let property here, different obligations apply, including the Non-resident Landlord Scheme.
Common Questions
I paid tax abroad on this income. Foreign tax credit relief is claimed through your tax return, not through the quarterly update. Ask UKPA.
Several properties in the same country. Add each one separately; they roll up into the one foreign source.
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