Tripcatcher uses the HMRC personal tax year for calculating your cumulative mileage, this is so that Tripcatcher can change your mileage rate from 45 pence per mile to 25 pence per mile once you pass the 10,000 mile threshold. Every year, on April 6th this mileage counter is reset back to 0. Using this personal tax year has no impact on your business tax year or vice versa.
Your mileage expense reporting should be done from your accounting package and not from Tripcatcher. Tripcatcher is the means to enter your mileage and you accounting package is the means to report on your mileage.
We expected trips to be published, from Tripcatcher, weekly or monthly and we also recommend that you publish your mileage expenses to your accounting package at your business year end. This will maximise the amount of cash you can withdraw from your business in that business tax year. The publishing of trips regularly is also important if you are reclaiming VAT, as the trips need to be published in the correct VAT quarter.
Also, in April, we suggest submitting one claim on the 6th April and the second at the end of April. This avoids having a claim span the personal tax year and keeps the accounts really tidy.