MTD Bridging Software for Landlords: Complete Guide 2026

What is MTD bridging software?

MTD bridging software sits between your spreadsheet and HMRC. You record your rental income and expenses in Excel or Google Sheets exactly as you do today. When a quarterly submission is due, the bridging tool reads the relevant cells — income, expenses, category totals — and transmits them to HMRC through the MTD for Income Tax API.

The term “bridging” refers to the gap it fills. HMRC requires every landlord within MTD to maintain digital records and submit via software. A spreadsheet alone is not enough — it has no direct connection to HMRC. Full cloud accounting software (QuickBooks, Xero, LandlordTaxAi) has that connection built in. Bridging software adds the connection on top of a spreadsheet, without changing the spreadsheet itself.

The mandatory start for landlords above £50,000 qualifying income is 6 April 2026, dropping to £30,000 from 6 April 2027. If you are in scope, you must be submitting through MTD-compatible software — bridging or full — from those dates. HMRC's overview of MTD for Income Tax sets out the full timetable.

For the broader context — thresholds, penalties, and what quarterly updates actually involve — read our complete MTD for landlords guide.

Who needs MTD bridging software?

Bridging software suits landlords who fall into one or more of these situations.

You have an established spreadsheet system

If you have spent years building an Excel workbook that tracks rent received, mortgage payments, repairs, letting agent invoices, and void periods across multiple properties, switching to new software feels like a large risk. Bridging software lets you carry on with what you know. You add a connection layer on top rather than rebuilding your records from scratch.

Your portfolio is simple and your income is straightforward

A landlord with one or two properties, consistent monthly rents, and a handful of known expenses each year does not need much automation. The bridging process — update your spreadsheet, run the bridging tool, confirm the submission — takes minutes per quarter. The cost and learning curve of full MTD software may not be justified.

You are already using a spreadsheet-native tool

Some landlords use tools such as 123 Sheets, which are designed from the ground up around a spreadsheet workflow. These products sit in the bridging category. If you are already in that ecosystem, you may not need to evaluate anything else.

You want the lowest-cost route into MTD compliance

Bridging software is typically cheaper than full-stack MTD software. If your spreadsheet records are already clean and your only requirement is to satisfy HMRC's digital submission rule, bridging software does the job at lower monthly cost.

How MTD bridging software works: the digital link explained

HMRC's MTD rules require an unbroken digital journey from the point where you first record a transaction to the point where it reaches HMRC. This is called the “digital link” requirement. Manual re-keying — typing a figure from one system into another by hand — breaks the chain and is not permitted.

The digital link rules are published in HMRC's MTD for Income Tax overview. In practice, this means:

• Copying and pasting within the same spreadsheet workbook is permitted.
• Using Excel formulas to aggregate data from one tab to another is permitted.
• Exporting a CSV from your accounting tool and importing it into another tool is permitted, provided the export and import are automated.
• Typing figures manually from a printout or screen into a separate tool is not permitted.

Bridging software satisfies this requirement by reading cells directly from your spreadsheet — either through a local file connection, a plug-in installed inside Excel, or by reading a shared Google Sheet — and transmitting the figures to HMRC without any manual intervention in between.

The typical bridging workflow runs as follows.

1. You record all rental income and allowable expenses in your spreadsheet throughout the quarter, categorised by the expense types HMRC expects (repairs, insurance, letting agent fees, mortgage interest, and so on).
2. You open the bridging software and connect it to your spreadsheet file. Most tools ask you to map cells: “cell B12 is total income, cell B14 is repairs, cell B16 is insurance” and so on. You do this mapping once; it is saved for future quarters.
3. The bridging software reads those cells, compiles the quarterly summary, and shows you a preview.
4. You confirm and submit. The software sends the data to HMRC via the MTD API. HMRC returns a submission reference and a confirmation.

The whole process, once your spreadsheet is in order and the cell-mapping is saved, typically takes under ten minutes per quarter.

MTD bridging software options compared

The table below covers the main bridging software products available to UK landlords and sole traders as of April 2026. Check the HMRC-approved MTD software list at gov.uk to confirm that any product you are considering remains on the official register before signing up.

Prices are approximate and subject to change. Always verify current pricing and HMRC compatibility on each provider's own website and the official HMRC software register.

When to choose bridging software — and when not to

Bridging software is the right choice in some situations and the wrong choice in others. Here is an honest comparison.

Choose bridging software if...

• You have a well-structured, consistent spreadsheet that you already understand and trust.
• Your rental income is straightforward — a small number of properties, regular rents, predictable expenses.
• You or your accountant are confident that your expense categorisation and Section 24 calculations are correct before submission.
• You want the lowest-friction, lowest-cost path into MTD compliance.
• You are resistant to changing software and have the bandwidth to maintain accurate spreadsheets quarterly.

Consider full MTD software if...

• You have four or more properties and find quarterly spreadsheet maintenance burdensome.
• You want your bank transactions imported and categorised automatically, rather than entering them manually.
• You want the software to map transactions to the correct SA105 property expense categories, reducing the risk of miscategorisation.
• You are unsure how to apply Section 24 mortgage interest restrictions or want software prompts and guardrails to help.
• You want quarterly deadline reminders, status dashboards, and submission confirmations in one place.

LandlordTaxAi is full MTD software, not bridging software. It connects to your bank via open banking, categorises transactions using AI trained on SA105 expense categories, and submits quarterly updates to HMRC. It is not the right tool if your goal is to keep your spreadsheet intact — for that, one of the bridging options above will serve you better.

If you are evaluating all the options side by side, read our best MTD software for landlords comparison, which covers both bridging and full-stack tools with feature-by-feature scoring.

Section 24 and the limits of bridging software

This is the area where landlords using bridging software most often run into problems. Bridging software submits the figures you give it. It does not validate them.

Section 24 of the Finance Act 2015 removed the ability for most UK landlords to deduct mortgage interest as a business expense. Instead, landlords now receive a basic rate tax credit worth 20% of their finance costs. The calculation is not simple: you need to apply it correctly to your property income on the SA105 pages to avoid either overpaying or underpaying tax.

If your spreadsheet applies Section 24 incorrectly — for example, if you are still deducting mortgage interest in full rather than claiming the 20% credit — your bridging software will faithfully submit those wrong figures to HMRC. It has no way of knowing they are incorrect.

The same risk applies to the distinction between capital and revenue expenditure. A new boiler replacing a like-for-like unit is typically an allowable revenue expense. An extension to the property is capital expenditure and is not deductible against rental income (though it may reduce a Capital Gains Tax liability when you sell). Bridging software cannot make that distinction for you.

This is not a criticism of bridging software — it is simply important to understand its scope. It is a submission tool, not an advisory tool. If your spreadsheet is correct, the submission will be correct. If you are unsure about the underlying tax treatment, bridging software will not catch the error.

Landlords using bridging software should have their spreadsheet template reviewed by a qualified accountant — ideally before they begin their first MTD year — to confirm that the expense categories, Section 24 treatment, and income calculations are right. This is a one-off investment that pays for itself many times over in reduced correction work later.

How to switch from bridging software to full MTD software

Many landlords start with bridging software and move to full MTD software once they experience the quarterly workload. The switch is straightforward if you follow these steps.

1. Choose your new software and create an account. Confirm it is on the HMRC-compatible software list. Most full MTD software products offer a free trial period.
2. Authorise the new software to connect to your HMRC account. You will revoke the old bridging tool's access and grant access to the new software. Only one software product can be the primary authorised agent at a time for MTD submissions.
3. Import or re-enter your current-year figures. If you are switching mid-year, you need to carry over the income and expense totals from quarters already submitted through bridging. Some full MTD software tools can import a CSV export from your spreadsheet. Others require manual entry of prior-quarter totals.
4. Verify that previous submissions are recorded. Log in to HMRC's Government Gateway and confirm that all prior quarterly updates for the current tax year are showing as received. Your new software may pull this history automatically via the HMRC API.
5. Set up bank feeds or CSV imports going forward. Full MTD software typically imports transactions directly. Give yourself two to three weeks before the next quarterly deadline to get your transaction data into the new system and categorised.
6. Cancel your bridging software subscription once you have confirmed the new software is working correctly and you have no outstanding submissions to make through the old tool.

You can find a curated shortlist of full MTD software options for landlords on our HMRC-approved MTD software list, which includes notes on which products are best suited to portfolio landlords versus those with a single property.

Preparing your spreadsheet for MTD bridging

If you plan to use bridging software, the quality of your submission depends entirely on the quality of your spreadsheet. These steps will reduce errors and make the quarterly submission process faster.

Use HMRC's expense categories

Your spreadsheet should separate expenses into the categories that HMRC expects on the SA105 property pages: rents, rates, and insurance; property repairs and maintenance; non-residential property finance costs; legal, management, and professional fees; cost of services provided; and other allowable property expenses. Keeping your spreadsheet aligned to these categories makes the bridging software mapping straightforward and reduces the risk of aggregated figures that do not match what HMRC expects.

Separate income and expenses by property

If you own more than one property, keep income and expenses on separate worksheet tabs per property. MTD for Income Tax requires you to report your UK property income as a single combined business — you do not submit property by property — but maintaining property-level detail in your spreadsheet makes it much easier to identify errors, reconcile with bank statements, and respond to any HMRC enquiry.

Reconcile to bank statements monthly, not quarterly

Quarterly reconciliation sounds manageable, but in practice many landlords find that three months of unreconciled transactions is a significant burden — particularly if they have had repairs, void periods, or tenant changeovers. A monthly reconciliation pass of fifteen to twenty minutes produces far fewer errors at quarter-end.

Date your transactions correctly

MTD quarterly updates cover specific date ranges: 6 April to 5 July, 6 July to 5 October, 6 October to 5 January, and 6 January to 5 April. Your bridging software will ask which quarter you are submitting. Make sure your spreadsheet uses actual transaction dates rather than the date you entered the record, so that income and expenses fall into the correct quarter.

Frequently asked questions