The appellant, a platinum mining company, was compulsorily registered for VAT in January 2017 but was subsequently deregistered due to insufficient turnover. In January 2019, it entered into a special mining lease with government and commenced development. On 1 January 2021, section 23(3) of the Value Added Tax Act was amended to deem holders of special mining leases as meeting VAT registration requirements, with retrospective effect from 1 January 2020. The appellant was re-registered for VAT in March 2021 with retrospective effect from 1 January 2020. It then submitted refund claims for input tax incurred during the period 1 January 2020 to 28 February 2021. The respondent processed claims 20B1 to 20B4 but disallowed claim 20B5 (September-October 2020) on grounds that the tax invoices did not comply with section 20 of the Act, specifically because they did not bear the appellant's VAT registration number (which the appellant did not have at the time as it had been deregistered). The respondent also raised concerns about duplicated invoices. The appellant's objection was dismissed, leading to this fiscal appeal.