If you're earning more than £85,000, it's important to register for the VAT taxable return. Once you're registered, you'll be sent a VAT registration certificate. This helps you confirm your VAT number. Make sure you're submitting your first VAT return and payment on time. Don't forget to take care of an effective date of registration. That's when you went over that threshold, or it was the date you were allowed to register on a voluntary basis.