If your Split Pay isn't at a 50/50 split yet, Split Pay's share of each bill grows automatically 5% each month you pay your second payment on time — up to a maximum of 50%.
Example: if your second payment is $300 this month (30% of a $1,000 bill):
Pay it on time → next month it'll be $350 (35%)
Pay that one on time → next month it'll be $400 (40%)
Keep going until you hit 50% of your total bill — from 30%, that takes 4 on-time months
This happens automatically. You don't need to ask, request it, or do anything other than pay on time. Your approved amount — the largest bill Split Pay will split, set 25% above the amount you requested — stays the same; what grows is Split Pay's share of each bill.
The other path to increase your approval:
Reapplying (after eligibility expires or if you want a fresh evaluation) starts from scratch with your current financial profile. Could go up, could stay the same, could go down — it's a fresh look. See the FAQ on Will I get the same approval amount if I reapply?.
The most reliable path is just paying on time and letting your share grow 5% each month.