Are overpayments towards a vehicle finance allowed?

I have financed a vehicle via my limited company, aside from expensing the monthly repayments, am I allowed to voluntarily pay in addition to, amounts, to reduce the total debt and will that reduce the total corporation tax due to be paid?

Hi Jay Khan,
This is a complicated area, and I would ask you to consider seeking professional advice from an accountant/tax advisor since HMRC would not be able to provide accountancy/tax advice to assist you with your query. 
I would, however, refer you to HMRC’s Business Leasing Manual at the weblinks below for further information. 
BLM32050 - Taxation of leases that are not long funding leases: finance lessees: general issues: depreciation method used
BLM32220 - Taxation of leases that are not long funding leases: finance lessees: taxation generally: use of generally accepted accounting practice
BLM00330 - Introduction: Lease taxation: Hire purchase contracts
CA23300 - Plant and Machinery Allowances (PMA): hire purchase: contents
Thank you.