IOU

Subject of this puzzle's theme

• Got you next time!

• Marker and letters dropped from this puzzle's four theme entries

• Next round's on me, for short

• Next round's on me

• Next time, my treat

• Pay you next time!

• Promise to pay letters

• Thanks for covering for me

• Will pay later

• $ promise

• Account receivable

• Acknowledgement of a debt

• Acknowledgment of debt

• Acknowledgment of debt, in brief

• Beholden letters

• Betting slip

• Bettor's letters

• Bettor's marker

• Bettor's note

• Bettor's slip

• Borrower's letters

• Borrower's note

• Brief chit

• Brief fiscal note

• Brief promise?

• Broke one's bet

• Broke poker player's note

• Broke poker player's promise

• California tax refund, perhaps

• Cash alternative

• Cash substitute

• Chit

• Chit for a chip, maybe

• Chit in a pot

• Chit letters

• Chit ltrs.

• Chit relative

• Chit sheet

• Chit used when you're out of chips

• Commitment to pay

• Controversial letters in California, these days

• Credit letters

• Creditor's chit

• Creditor's holding

• Debenture, basically

• Debt acknowledgement

• Debt chit

• Debt doc

• Debt letters

• Debt memo

• Debt note

• Debt reminder

• Debt statement

• Debt to be paid

• Debt voucher

• Debt write-up

• Debt, in short

• Debtor bettor's letters

• Debtor's acknowledgment

• Debtor's chit

• Debtor's doc.

• Debtor's document

• Debtor's letter

• Debtor's onus

• Debtor's paper

• Debtor's pledge

• Debtor's promise

• Evidence of debt

• Evidence of obligation

• Fin. obligation

• Form of debt that's this puzzle's theme

• Gambler's chit

• Gambler's last resort

• Gambler's marker

• Gambler's note

• Gambling note

• Indebtedness initials

• Indication of debt

• Informal debt instrument

• Informal repayment promise

• Initial promise?

• Initials of obligation.

• Inits. on a debtor's note

• It might be called in

• It's exchanged for cash

• Item in a poker pot

• Kitty letters?

• Last poker bet, sometimes

• Lendee's note

• Lendee's slip

• Letters a collector receives?

• Letters before a monetary amount

• Letters for bettors or debtors

• Letters for debtors

• Letters for those in the hole

• Letters from a debtor

• Letters from a person who's shy?

• Letters from a short person?

• Letters from one who's shy?

• Letters of credit

• Letters of debt

• Letters of note?

• Letters of obligation

• Letters of payback

• Letters often followed by a dollar amount

• Letters often followed by a number

• Letters on a chit

• Letters on a debtor's slip

• Letters on a note

• Letters preceding an amount of money

• Letters that are economic fetters

• Letters that could precede a dollar sign

• Letters that mean you'll get paid back

• Letters that might precede a dollar sign

• Letters to a creditor

• Letters written by a shy guy?

• Letters written by someone who's a bit shy?

• Letters written by someone who's shy?

• Loan agreement

• Loan letters

• Loan note

• Loser's slip

• Losing gambler's marker

• Losing gambler's note

• Marker

• Marker letters

• Marker of a sort

• Marker, briefly

• Marker, for short

• Marker, of sorts

• Marker, so to speak

• Money substitute, for short

• Note

• Note from a busted person

• Note from a card game

• Note from an unlucky gambler?

• Note from one who's shy

• Note from someone shy?

• Note from someone who's needy?

• Note in a poker game, e.g.

• Note in a pot, perhaps

• Note in place of money

• Note left after stealing a roommate's food, say

• Note left after stealing your roommate's beer

• Note of debt

• Note promising notes

• Note to be paid

• Note to be used later

• Note traded for bills

• Obligation of a sort

• Offering from a short person

• Outstanding vowels?

• Paper in a poker pot

• Paper in a pot

• Paper in a pot, maybe

• Paper in lieu of payment

• Paper needing settling

• Part of a poker pot

• Payback promise

• Payback without the payback

• Payer's promise

• Payment marker

• Payment pledge

• Payment promise

• Payment promise letters

• Payment proxy

• Payment substitute

• Pecuniary promise

• Personal marker

• Player's marker, perhaps

• Poker game memento, maybe

• Poker night marker

• Poker player's last resort

• Poker pot item, perhaps

• Poker pot paper

• Poker pot paper, perhaps

• Pot marker

• Pot paper

• Prom. note

• Promise of a sort

• Promise of payment

• Promise to pay

• Promise to pay, briefly

• Promise to pay: abbr.

• Promising letters

• Promising note

• Promissory initials

• Promissory letters?

• Promissory note

• Promissory note acronym

• Promissory note, of a sort

• Questionable pot addition

• Red letters?

• Repayment reminder

• Short person's offering?

• Short person's slip?

• Short promise?

• Shy person's writing?

• Signed note

• Signed promise to pay

• Sketchy substitute for cash

• Slip among chips?

• Slip from a loser

• Slip in a pot

• Slip in the pot

• Slip of paper in a poker pot

• Slip signed by a debtor

• Slip-in with the antes

• Something to pay

• Something to pay off

• Statement to the IRS?

• T-bill, essentially

• Tapped-out person's letters

• Three vowels that mean you'll get your money

• Unlucky gambler's note

• Unofficial promissory note

• Vow to pony up

• Written acknowledgment of a debt

• Written debt acknowledgment

• An informal debt instrument

• Representing