How to Add Mortgage Interest in the Pie App | Step-by-Step Guide

How to Add Mortgage Interest in the Pie App | Step-by-Step Guide
Charlotte Baroukh

Charlotte Baroukh

Tax Expert @ Pie

4 min read

Updated: 2 Dec 2025

4 min read

Updated: 2 Dec 2025

Step-by-step Guide For Landlords and Property Owners

If you’ve got a buy-to-let or rental property, your mortgage interest is one of the biggest allowable expenses you can claim. Adding it to the Pie App keeps your tax position up-to-date in real time so you can see exactly what your bill looks like and stay in control of your finances.

Here’s how to add it in just a few taps. 


Your Step-by-Step Guide

Adding mortgage interest is quick and easy. Follow these steps:

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Open the Pie App

Head straight to your dashboard everything starts from there. At the bottom of your screen, hit the + icon and select Quick Add.

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Select Add Expense

This opens the expense form where you can record anything related to your property.

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Choose your Income source (Property)

 Select the property this expense relates to for example, Property 1.

  • Merchant name: e.g. Mortgage Interest
  • Amount: the interest amount only (not capital repayment)
  • Date: the date you paid it
  • Add a receipt or note if you want to keep things organised.


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Choose the Expense category

Scroll down and select Mortgage interest from the property expense categories. Your mortgage interest is now saved and automatically reflected in your tax calculations. That’s it you’re done in seconds.

Why adding it matters

Adding your mortgage interest matters because it’s often one of your biggest costs as a landlord. Recording it properly helps Pie update your real-time tax projections, keep your bookkeeping accurate, and make sure nothing gets missed when it’s time to file. Simple steps now mean fewer surprises later.

Summary

Adding your mortgage interest in the Pie App only takes a moment, and it means your tax overview stays accurate, up to date and stress-free. Just head to Quick Add, record the expense under your chosen property,


Select Mortgage interest, and save. If you ever need to update or review it later, everything is stored neatly in one place keeping you in control and helping Pie do the heavy lifting when it comes to your tax.

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