Fees included in the application for a Tier 1 visa vary depending on where you are applying from:

If you are applying from within the United Kingdom, the application costs GBP 750. This fee also applies if you are applying for an extension within the highly skilled worker category under the previous HMSP. However, if you can submit a valid HSMP approval letter for switching into Tier 1 (General) along with your application, you will need to pay only GBP 350 since you have previously paid for the approval letter. Furthermore, applications made by your dependants sent together with your application form will be free of charge. Dependant applications sent separately or at a later time are charged a separate fee of GBP 395.
If you are applying from outside the UK, the fees are GBP 600 for all applicants and GBP 200 if you can submit a valid HSMP approval letter. All fees are payable in local currency.

Fees should be sent in together with the application form/s, otherwise your application will not be considered by the UK Border Agency. If you send in more than one application, you will be charged a standard fee for each application.

Also, make sure to fill out the payment slip correctly. Double-check the information you enter, as errors will affect your application process and delay your receiving the results of your application.

If you are a national of one of these countries, your application for a Tier 1 visa is free of charge: Albania, Andorra, Armenia, Azerbaijan, Croatia, Georgia, FYR of Macedonia, Moldova, Turkey, and the Ukraine.

Once payment has been received, it can no longer be refunded even if the application is not successful and gets refused or if the applicant withdraws the application.