Aggregate Score in Football: Two-Legged Ties, Extra Time and the Away-Goals Rule

A two-legged tie consists of one match at each team's home ground, with the order of the two legs typically decided by the competition draw. The aggregate score is simply the sum of the two final scores: Team A wins 2-1 at home and loses 0-1 away, the aggregate is 2-2 with Team A having scored two and Team B having scored two. If the aggregate is uneven, the team with the higher total advances to the next round and the tie is over at the final whistle of the second leg.

If the aggregate is level at the end of the second leg, the tie used to be decided immediately by the away-goals rule. From 2021 onwards in UEFA competition (and from 2022 in CONMEBOL), level aggregates go to 30 minutes of extra time at the second-leg venue, and then a penalty shootout if extra time itself ends level. The second-leg host therefore has the structural advantage of playing the extra-time period at home, which is one of the reasons UEFA cited for abolishing the away-goals rule.

The away-goals rule was introduced by UEFA in 1965 to encourage attacking football away from home and to reduce the number of replays needed at neutral venues. The rule stated that if the aggregate score was level after both legs, the team that had scored more goals away from home advanced. If away goals were also equal, the tie went to extra time, and away goals scored in extra time counted at higher value than home goals.

UEFA's Football Committee voted unanimously to abolish the rule in June 2021, citing two main arguments. First, the original rationale (away travel was difficult, fans rarely travelled, away teams played defensively) was outdated: travel and ticketing had transformed since 1965, and away sides increasingly tried to win matches outright. Second, the rule perversely discouraged scoring in the first leg at home, because a 0-0 home leg was tactically equivalent to a 1-1 home leg under the away-goals weighting. The 2021-22 Champions League was the first major UEFA competition without the rule, and the 2022-23 final between Manchester City and Inter Milan was a direct beneficiary of the cleaner format.

Extra time is two periods of 15 minutes added to the end of a knockout match (or, in two-legged ties, to the end of the second leg) when the score is level after 90 minutes. The current IFAB rules require both 15-minute periods to be played in full regardless of when goals are scored: the team in the lead at the end of the second 15 minutes wins. Penalty shootouts follow only if extra time itself ends level.

The golden-goal rule, used at the 1998 and 2002 World Cups and Euro 1996 and Euro 2000, allowed the first team to score in extra time to win the match immediately. It was scrapped by IFAB in 2004 on the grounds that it encouraged defensive play in extra time and produced too many shootouts despite its original intent to reduce them. The silver-goal rule, briefly trialled at Euro 2004, ended extra time at the first half-time break if one team led: also scrapped, on the same grounds.

• 1965-2021. Away-goals rule active in UEFA competition. Goals scored away counted double in the event of an aggregate tie.
• 2021. UEFA abolish the away-goals rule for all competitions from the qualifying rounds onwards.
• Extra time. Two 15-minute halves at the second-leg venue. Played in full; no golden goal.
• Penalty shootout. Five rounds of penalties, then sudden death. The team with more conversions wins.

UEFA scrapped the rule, but not every confederation has followed. CONMEBOL (the South American confederation) maintained the away-goals rule through 2021 and then abolished it for the 2022 Copa Libertadores onwards, aligning with the European reform. CAF (Africa) and AFC (Asia) have continued to apply some form of the rule in their continental competitions through 2024, with periodic reviews. CONCACAF dropped the rule from the Champions Cup in 2018.

Domestic cup competitions are a separate question. The League Cup in England is single-leg from the quarter-finals onwards, so the rule never applied. The Copa del Rey in Spain went single-leg in 2019. The Coppa Italia is single-leg throughout. The major remaining two-legged domestic competition in the top European tier is the German DFB-Pokal semi-final, which has historically been single-leg. In practice, the away-goals rule today is mostly a CAF and AFC concern.

The most famous away-goals-rule swing was Barcelona's 6-1 second-leg win over Paris Saint-Germain in March 2017, overturning a 4-0 first-leg deficit on aggregate 6-5. PSG's single away goal in the second leg would have been decisive under the rule had Barcelona not scored late: Sergi Roberto's 95th-minute goal made it 6-1 on the night, eliminating the away-goal arithmetic and sending Barcelona through outright.

Manchester City's elimination by Tottenham in the 2018-19 Champions League quarter-final ran the other way: a 4-3 second-leg win at the Etihad left both legs aggregate-level at 4-4, with Tottenham advancing on three away goals to one. That tie is sometimes cited as the marquee case for abolishing the rule, because the City side that won the home match outscored the visiting side and still went out on a tiebreaker. With the post-2021 rule, the same scoreline would have gone to extra time at the Etihad.