Cash savings above GBP 16,000 can be used to meet an income shortfall, but the source text states this savings-shortfall method does not apply if the sponsor is self-employed.
For self-employed sponsors, compliance is based on declared taxable profit meeting the threshold in the last financial year, or average profit across the last two financial-year end dates.
The source formula uses: A (required income), B (income), C (shortfall), D (2.5 years for 30 months leave), E (required extra savings), and F (GBP 16,000 base savings figure).
Formula structure: A minus B equals C; C multiplied by 2.5 equals E; E plus 16,000 gives total savings required.
Example from source: with no income, 29,000 x 2.5 + 16,000 = 88,500 total savings.
Example from source: with 15,000 income, shortfall 14,000 x 2.5 + 16,000 = 51,000 total savings.