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The NJB Taxback Rebate Calculator

Supercharge your tax rebate in a few seconds with our Free In-App tax rebate calculator.

Our tax rebates are guaranteed against HMRC investigation. So all you need to worry about, is what to spend it on!

  • CIS, Self-employment, covid Grants & PAYE

  • Guaranteed against HMRC investigation

  • No percentage based fees

The NJB Taxback App

The NJB Taxback App is a revolutionary one-stop solution to filing your end of year self-assessment tax return.

Putting 13+ years of experience and expertise in accounting in the palm of your hand.

Our industry-leading features include:

Tax Rebate Calculator

Our free App includes the most comprehensive rebate calculator on the market.

With the ability to include PAYE, CIS, Self-employment and Covid Grants and receive an accurate calculation in an instant.

The native in-App experience helps to complete the calculation in a moment. The only thing left to worry about it, is what to spend it on!

Download our App now to get started.

Progress Tracking

Our App features a live progress tracker for your tax return. Our App is always up to date and reflects the live status of your tax return.

So, if it’s 2 am on April the 6th, and you are waiting for HMRC to issue your rebate, this is the place to check!

Get in Touch


The volume of information needed to complete your tax return can be overwhelming at times, so we’ve stripped it down.

Each time there is an update our App will deliver a simple notification.

For most updates, the App notification is probably enough information.

However, you will find more details in the accompanying message. 


Did you receive your rebate?

Did you receive our post?

In most cases a simple tap to confirm is all we need.

Get in Touch


The number of platforms and devices that can be used to deliver messages can often lead to communication becoming fragmented across many different areas.

Our App combats this by delivering all the vital messages required to complete your tax return through one centralised system.

This means everything you ever need from us is in one place, regardless of the device, phone number or platform you choose to use. 

Your Documents

Here you will find all your business records, including copies of any records you provide to us.

The requirement to provide three years of turnovers at once during the COVID SEISS grant applications made us rethink how we store and deliver your records. 

This is our solution.

Everything you may ever need, whether it’s tax returns or SA302’s.

All securely stored and freely accessible at your convenience.

Get in Touch

Get in Touch

Online, On the Phone, On-Site: We are flexible and can help you in whichever way you are most comfortable, online, on paper, over the phone, face to face, whatever suits you.

Download Our Free App

Download our free app on the iOS Appstore and Google Playstore. 

Speak To Us

Available Monday to Friday 09:00 – 17:00

Call 020 3822 0201


Contact Online

Leave a message on our contact form and a member of staff will get in touch with you as soon as possible.

Get In Touch

Download our app today to get started

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NJB Taxback Ltd

Kemp House
124 City Road