The 2020 All-Ireland football championship will be straight knock-out while the hurling championship will contain a backdoor format, the GAA has confirmed.
For the first time since 2000, the football championship will be a do-or-die scenario with the All-Ireland final set to be staged on Saturday, 19 December, two weeks after the semi-finals.
The hurling final will be played on Sunday, 13 December.
All knockout games will be finished on the day, with penalties if required, including provincial and All-Ireland finals.
The inter-county scene will recommence on 17 October where the final two rounds of the league will be played before the race for Sam Maguire begins in earnest.
New York won't be part of the Connacht or All-Ireland Championship, but London will compete in 2020.
The Association has confirmed that the provincial and All-Ireland club championships as well as the All-Ireland Schools Series and Tailteann Cup, have been postponed for the calendar year.
Club county championships will take place in the 11 week window from 31 July.
The All-Ireland hurling championship will be a knockout format in both provinces, with two rounds of qualifiers.
The final rounds of the Allianz League will not be played, with Limerick and Clare declared the respective winners of 1A and 1B. Should the two counties be drawn to meet in the Championship, the game will double up as a league decider.
The draws for the Munster and Leinster Senior Hurling Championships will take place live on RTÉ's Six One news this evening, along with the Leinster Football Championship to decide potential semi-final pairings.
Munster will revert back to the format last used in 2017 with an open draw to include one quarter-final, two semi-finals and a final with a backdoor for teams beaten along the way.
In Leinster, Wexford, the current champions, and Kilkenny, beaten finalists last year, will receive byes to the semi-final but can face each other at that stage.
The other teams, Dubin, Galway and Laois, will go in the hat to determine which two will meet in a quarter-final.
As in Munster, beaten teams will get a second chance in the qualifiers.
The hurling series will kick-start the inter-county championship season with provincial games commencing at the end of October.
The Joe McDonagh Cup format remains the same, but the finalists won't proceed to the race for Liam MacCarthy and will be a curtain raiser to the All-Ireland hurling final.
Participation of British teams in the Ring and Rackard teams will depend on travel situation between Ireland and Britain.
The Under-20 hurling championship will also commence in mid-October and played on a straight knockout basis, while the minor hurling and football championships will similarly be played off without the safety net of a backdoor.
GAA INTER-COUNTY FIXTURES
Allianz Football League Round 7
Munster SHC 1/4-final
Leinster SHC 1/4 final
Christy Ring and Nickey Rackard 1/4 finals
Joe McDonagh & Lory Meagher Round 1
31 October/ 1 November
Connacht SFC 1/4 finals
Munster SFC 1/4 finals
Leinster SFC Round 1
Ulster SFC preliminary round/1/4 finals
Munster SHC semi-finals
Leinster SHC semi-finals
Joe McDonagh & Lory Meagher Round 2
Christy Ring & Nickey Rackard semi-finals & relegation semi-finals
Connacht SFC semi-finals
Munster SFC semi-finals
Leinster SFC 1/4 finals
Ulster SFC 1/4 finals
All-Ireland SHC Qualifier Round 1 (2 games)
Joe McDonagh Round 3 (1 Game)
Christy Ring & Nickey Rackard Relegation finals
Lory Meagher Round 3
Connacht SFC final
Leinster SFC semi-finals
Ulster SFC semi-final
Leinster SHC final
Munster SHC final
All-Ireland SHC Qualifier Round 2 (2 games)
Joe McDonagh Round 3 (1 game)
Christy Ring, Nickey Rackard & Lory Meagher finals
Leinster SFC final
Joe McDonagh Round 4
All-Ireland SHC quarter-finals (2 games)
Munster SFC final
Ulster SFC final
Bord Gáis Energy All-Ireland U20 SHC final
All-Ireland SHC semi-final (Leinster champion v 1/4 final winner)
Joe McDonagh Round 5
All-Ireland SHC semi-final (Munster champions v 1/4 final winner)
All-Ireland MFC semi-finals
All-Ireland MHC semi-finals
All-Ireland SFC semi-final (Leinster champion v Ulster champion)
All-Ireland SFC semi-final (Connacht champion v Munster champion)
All-Ireland MFC final
All-Ireland MHC final
All-Ireland SHC final
Joe McDonagh final
All-Ireland SFC final