Enter the core financial information to calculate interest. 

If the paying party has made any partial payments, record them in this section to reduce the principal sum. The calculator will automatically include these reductions in the running balance, ensuring interest accrues only on the remaining debt from the date of each payment.

To add a single partial payment: 

Recurring Payments

If the paying party has made regular payments towards the principal sum, these can be recorded by clicking on the Add recurring payments button. 

As you fill in the fields, a Preview section updates in real time showing each generated payment with its date and amount, along with a count of how many will be created.

Once you are happy with the preview, click Insert generated payments. All the entries will be saved and will appear in the payments list above. The recurring payments panel will close and reset, ready to be used again if needed. 

Editing / deleting payments

To amend an existing recurring payment, click the pencil icon next to it. The row switches to edit mode, showing editable date and amount fields. Make your changes and click Save to confirm or Cancel to discard the changes.

To remove a payment, click the bin icon next to it. An undo notification will briefly appear at the bottom of the section — click Undo if you change your mind or clicked this in error. 

The results panel on the right-hand side provides an up-to-date breakdown of the interest and current balance as of the end date. When any changes are made to the previously entered information, this panel updates in real time. 

Here are some key terms seen in this panel: 

• Total interest accrued – The total simple interest calculated for the period. 

• Total days – The full number of days between the calculation start and end date. 

• Periods – The number of calculation segments. A new period starts for each partial payment. 

• Principal & accrued interest outstanding – The total amount still owed after all payments and accrued interest. 

• Calculation notes – A reference denoting how the calculation is performed. 

Once the calculation has been completed, two export options appear at the bottom of the results panel.

• Copy calculation - Copies a formatted table of the result to your clipboard, ready to paste.
• Upload to LEAP - Generates an Excel document containing the results, directly uploads into the matter correspondence, and previews the uploaded document.
  • Word - Click on the small dropdown arrow on the right of the Upload to LEAP button to select Word, generates a Word document containing the results instead of Excel.

Here’s an example of how the uploaded file will look like once opened: 

Each file is headed with the following information: 

Saved Calculations

Each calculation is automatically saved against the matter it was run from. If you close the app and reopen it from the same matter, all the previous financial information and results will be loaded automatically – no need to re-enter anything. Each matter keeps its own set of calculations.

Want to remove saved calculations? Clicking on the Reset button at the bottom of the partial payments section will clear all previously entered financial information. 

Enter information about the type of asset that has been disposed.

• Asset name (optional) – A label identifying the asset disposed, to be included in the export.
• Asset type – The type of property or asset disposed. Different reliefs can apply based on the type of asset.

Enter information about who is disposing the asset and how much annual exemption they have remaining.

• Taxpayer type - The type of entity disposing the asset, which controls the rate of tax applied and the total annual exempt amount available:

• Annual exemption already fully used this tax year - Tick if the full annual exempt amount has already been used in other disposals for the same tax period.
  • Exemption used elsewhere – If only part of the exempt amount has been used, enter how much. This will reduce the available exemption by the entered amount. Leave blank if not applicable.

Enter the financial costs involved in obtaining the asset, and any individual’s taxable income.

• Purchase price – The original cost to acquire the asset, or the market value at the time it was acquired.
• Allowable costs – The expenses directly related to acquiring, improving, or selling the asset. This includes solicitor/estate agent fees, stamp duty, fixtures and fittings. Day-to-day maintenance and repairs do not qualify.
• Losses – Any capital lost over previous asset disposals, that have not been applied against a gain. These reduce the gain before the annual exempt amount is deducted. Leave blank if not applicable.
• Taxable income (Individual only) – Total annual income received, minus personal allowance.
  • If this figure is not known, subtract personal allowance (£12570 for most, can be less due to tax rate adjustments) from the individual’s annual income.
  • If annual income did not exceed the individual’s personal allowance, leave blank.
  • If annual income is above £50270, enter £37700 (the maximum amount of basic rate band).

This is used to determine the amount of basic rate band left for the tax year that can be used for this
calculation.

Enter how the asset was disposed of and how much it was disposed for.

• Sale or transfer – The method of disposal. Select “Transfer to Spouse/Civil Partner” if the asset was transferred to a partner or previous partner’s name. This will display the no gain / no loss rules where transfers occur after divorce/dissolution, or up to 3 years within the current tax year after separation.
• Disposal date – The date when the asset was sold or transferred. This determines which tax year's rates and allowances apply. The calculator supports dates from 6 April 2019.
• Disposal price – The amount received when the asset was sold, or the market value at the time it was transferred.

When the Purchase price and Disposal price have been entered, the calculation results will appear on the right-hand side.

The results panel on the right-hand side provides a breakdown of the estimated CGT liability due, based on the information provided. When any changes are made to the previously entered information, this panel updates in real time.

Here are some key terms seen in this panel:

• Total CGT payable – The estimated CGT liability calculated for the asset.

• Total gain – The amount of taxable profit obtained from asset disposal.

• Taxable gain – The amount of taxable profit liable for CGT, after applying the annual exemption amount.

• Effective rate – The overall percentage of tax applied on the taxable gain.

The disclaimer notice is added at the bottom of the results, along with any applicable notices based on the entered information.

Once the calculation has been completed, two export options appear at the bottom of the results panel.

• Copy calculation – Copies a formatted table of the result to your clipboard, ready to paste.
• Upload to LEAP – Generates an Excel document containing the results, directly uploads into the matter correspondence, and previews the uploaded document.
  • Word – Click on the small dropdown arrow on the right of the Upload to LEAP button to select Word, generates a Word document containing the results instead of Excel.

Here’s an example of how the uploaded file will look like once opened:

Each file is headed with the following information:

Saved Calculations

Each calculation is automatically saved against the matter it was run from. If you close the app and reopen it from the same matter, all the previous financial information and results will be loaded automatically – no need to re-enter anything. Each matter keeps its own set of calculations.

Want to remove saved calculations? Clicking on the Reset button at the bottom of the disposal details section will clear all previously entered financial information.

Enter the order information to calculate indexation.

The results panel on the right-hand side provides a breakdown of the indexation based on the provided information. When any changes are made to the previously entered information, this panel updates in real time.

Here are some key terms seen in this panel:

• Current Indexed Amount – The amount of monthly maintenance calculated after indexation.
• Total increase – The compounded percentage change from the original maintenance amount to the current indexed amount.
• Anniversary – The label identifying each yearly period.
• Start Index – The index value at the first month of the period.
• End Index – The index value at the last month of the period.

The index data is sourced from the ONS (Office for National Statistics) and updated monthly. The latest published month will appear here.

Once the calculation has been completed, two export options appear at the bottom of the results panel.

Copy calculation – Copies a formatted table of the result to your clipboard, ready to paste

Upload to LEAP – Generates an Excel document containing the results, directly uploads into the matter correspondence, and previews the uploaded document.

• Word – Click on the small dropdown arrow on the right of the Upload to LEAP button to select Word, generates a Word document containing the results instead of Excel.

Here’s an example of how the uploaded file will look like once opened:

Each file is headed with the following information:

Saved Calculations

Each calculation is automatically saved against the matter it was run from. If you close the app and reopen it from the same matter, all the previous financial information and results will be loaded automatically – no need to re-enter anything. Each matter keeps its own set of calculations.

Want to remove saved calculations? Clicking on the Reset button at the bottom of the disposal details section will clear all previously entered financial information.