credit cards: seat / family-plan math for “cashback credit cards” — price active seats before annual

Nubank, Inter, and C6 Bank on the seat bill

Nubank only passes “cashback credit cards” hype if per-active-seat price is written down.

Inter shows near “best cash back cards”; measure real seats, not the brochure.

Keep C6 Bank ready to freeze the shortlist if family plans hide overage.

Fails that kill annual

• Seats on Nubank/Inter sold without active logins.
• Family plan on C6 Bank with no device cap.
• “best credit cards 2026” never becomes cost per seat.
• Incomplete sheet with 7+ seats.

Seat go / no-go

Consider annual on card-picks-2026 only with a green sheet and cost/seat <= $17. Otherwise stay monthly.

Compare Card revisits when “cashback credit cards” or “best cash back cards” change headcount.

Kit: active seats, written price, family rules, invoice owner, sentence tying “double cash back cards” to seat math.

Compare Card (card-picks-2026) treats “cashback credit cards” as a seat spreadsheet — not a blind annual upgrade for credit cards.

Signals (“best cash back cards”, “double cash back cards”, “best credit cards 2026”) only count after summing real seats on Nubank/Inter/C6 Bank.

Rule: if cost per active seat exceeds $17/month in real use, stay monthly.

Seat math for credit cards

card exit. Note cancel window and any penalty on Nubank; log contracted seats vs active logins.

effective annual fee. Add fee + fx + optional insurance over 12 months on Inter; compare a family/team of 7 people.

real cashback. Simulate 3 categories from your statement on C6 Bank. No written per-seat price → sheet fails.

Three paths a team runs in Knoxville

A technical founder in Knoxville measured 7 seats on Nubank, mirrored on Inter, and kept C6 Bank as control.

Ceiling ~$171/month. Idle seats > 20% → cut the plan or stay monthly.

Seat sheet (fill in)

Metric	Nubank	Inter	C6 Bank
Contracted seats
Active logins 7d
card exit
effective annual fee
real cashback
Cost/seat ($ <= 17)
Family/team size

On card-picks-2026, if “cashback credit cards” cannot fit cost-per-seat on Nubank, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best cash back cards” cannot fit cost-per-seat on Inter, Compare Card treats it as credit cards noise.

On card-picks-2026, if “double cash back cards” cannot fit cost-per-seat on C6 Bank, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best credit cards 2026” cannot fit cost-per-seat on Nubank, Compare Card treats it as credit cards noise.

On card-picks-2026, if “no annual fee card” cannot fit cost-per-seat on Inter, Compare Card treats it as credit cards noise.

On card-picks-2026, if “cash back cards” cannot fit cost-per-seat on C6 Bank, Compare Card treats it as credit cards noise.

On card-picks-2026, if “credit cards” cannot fit cost-per-seat on Nubank, Compare Card treats it as credit cards noise.

On card-picks-2026, if “cashback credit cards” cannot fit cost-per-seat on Inter, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best cash back cards” cannot fit cost-per-seat on C6 Bank, Compare Card treats it as credit cards noise.

On card-picks-2026, if “double cash back cards” cannot fit cost-per-seat on Nubank, Compare Card treats it as credit cards noise.

On card-picks-2026, if “best credit cards 2026” cannot fit cost-per-seat on Inter, Compare Card treats it as credit cards noise.

On card-picks-2026, if “no annual fee card” cannot fit cost-per-seat on C6 Bank, Compare Card treats it as credit cards noise.

Compare Card · card-picks-2026: seat math for “cashback credit cards” on Nubank/Inter/C6 Bank before annual credit cards.

card-picks-2026-seat-family-plan-math-2026-08-13 proof 1: in Worcester, a technical founder ran effective annual fee on Nubank (add fee + FX + optional insurance over 12 months) and filed credit cards in 26 min. Compare Card does not reuse card-picks-2026-seat-family-plan-math-2026-08-13 on another card-picks-2026 date.

card-picks-2026-seat-family-plan-math-2026-08-13 proof 2: in Worcester, a technical founder ran real cashback on Inter (simulate 3 categories from your statement) and filed credit cards in 27 min. Compare Card does not reuse card-picks-2026-seat-family-plan-math-2026-08-13 on another card-picks-2026 date.