There are very detailed regulations to determine whether an expense claim in taxable or not.
The UK regulations can be found in HMRC Employer Further Guide to PAYE and NICs – CWG2. Any expenses paid to you will comply with the Guide.
The employer is required to keep records of all payments and where necessary report them to HMRC at the tax year end on the form P11D (in the UK). Most business travel, including subsistence costs associated with business travel, no longer need to be reported on the form P11D nor included in the employee’s personal tax return. However, you must still confirm the reason for every expense claim and send copies of the receipts. Any unexplained expense will be taxable by default at the year end.
The UK regulations can be found in HMRC Employer Further Guide to PAYE and NICs – CWG2. Any expenses paid to you will comply with the Guide.
The employer is required to keep records of all payments and where necessary report them to HMRC at the tax year end on the form P11D (in the UK). Most business travel, including subsistence costs associated with business travel, no longer need to be reported on the form P11D nor included in the employee’s personal tax return. However, you must still confirm the reason for every expense claim and send copies of the receipts. Any unexplained expense will be taxable by default at the year end.