Incumbent Vice-PresidentNoli de Castro was allowed to seek re-election though he could have possibly sought the presidency. As he didn't offer himself in any manner of candidacy at the election, his successor was determined as the 15th Vice President of the Philippines. Although most presidential candidates have running mates, the president and vice president are elected separately, and the winning candidates may be of different political parties.
This election was also the first time that the Commission of Elections (COMELEC) implemented full automation of elections, pursuant to Republic Act 9369, “An act authorizing the Commission on Elections to use an Automated Election System in the May 11, 1998 National or Local Elections and in subsequent National And Local Electoral Exercises”.
December 2 - ANC Presidential Forum: Analysts and viewers say Aquino gave "strong performance" and sounded "credible" (42%). Teodoro close second (37%); flip-flops on Reproductive Health Bill position. Villar was absent.
December 11 - Outgoing Vice President Noli De Castro endorses Roxas for vice president.
December 21 - Perlas protests disqualification at COMELEC.
December 28 - COMELEC hears appeal and petition of disqualified candidates.
December 21–22 - Pulse Asia Dec 2009 polls: Aquino solidifies lead in(45%) and BW-SWS (46%) presidential surveys. Legarda (37%) and Roxas (39%) are statistically tied in first place for the Pulse Asia vice-presidency survey.
January 20 - Estrada is allowed to run after the COMELEC threw out all three disqualification cases against him.
January 29 - De La Salle University and ANC 2010 Presidential Youth Forum Youth 2010: Audience members say Aquino, Gordon, Teodoro "made a favorable impression". Madrigal attends for the first time. Estrada absent.
February 8 - The Inquirer 1st Edition Presidential Debate with all candidates attending except Acosta and Estrada, with the latter citing "bias" against him.
March 4 - COMELEC disqualifies Vetellano Acosta. His name, however, would remain in the ballot although votes that would be cast for him will be considered invalid.
March 21 - ABS-CBN and ANC Vice-Presidential Debate: Analysts and viewers say that Roxas is seen as "most credible candidate" (54%) with Binay, Fernando tie in second (13%) and Yasay (11%); Legarda fared poorly (4%). Absent was Chipeco and Manzano whose absence drew comments on social-networking sites. Analysts point out also not "to belittle" the underdogs and praised Binay, Yasay and Sonza.
March 28 - A number of Lakas-Kampi-CMD stalwarts leave party to support Villar.The Liberal Party says these defections are "completing the Villarroyo [Villar-Arroyo] puzzle". Malacañang downplays defections and denies alliance with Villar.
March 30 - Teodoro resigns as Lakas-Kampi-CMD Chairman to focus on campaign. This fuels further speculation that President Arroyo is dropping her financial support for her party in exchange of new support in Villar due to "winnability". Sarangani Governor and party president Miguel Dominguez and secretary-general Francis Manglapus follows in less than 24 hours. Malacañang denies speculations that the resignations have something to do with rumors that Pres. Arroyo has decided to support another presidential candidate.
April 6 - Pulse Asia March 2010 survey: Villar (25%) falls 4 points as Aquino (37%) widens lead. According to Pulse Asia,this was mainly due to the Villarroyo issue. This came at the heels of talks that Villar is the "secret candidate" of Pres. Arroyo, a charge that he denies.
April 10 – May 10 – Overseas absentee voting continuing until May 10 (Election day). Two polling precincts encountered technical problems in Hong Kong, raising concerns on the automation system.
April 29 – COMELEC rejects proposals of a parallel manual count aside from the official tabulation.
First Week of May - Smartmatic-TIM recalls the Compact Flash Cards (CFC) of all Precinct Count Optical Scanner (PCOS) Machines due to the machines not counting the votes correctly due to the spacing of the ballot. These were found out after testing. By Election Day, 99% of all CF Cards were already delivered. The remaining 1% was due to some inaccessible precincts.
May 5 - Iglesia ni Cristo endorses the tandem of Benigno Aquino III and Mar Roxas (Liberal Party). Voting as a block, the INC has an estimated command votes of 5-8 million.
May 8 – The Supreme Court junks petitions to postpone the electionsdue to the technical sifficulties found with the issue of the CF Cards 
May 10 — Election Day
May 10 – COMELEC extends the voting hours until 7 pm.
May 11 – After initial election results, De los Reyes, Gordon, Teodoro, Villar and Villanueva conceded defeat to Aquino in the presidential race while Estrada says he won't concede and will wait for the congressional canvass. Chipeco, Legarda, Manzano and Yasay conceded defeat in the vice presidential race.
May 25 – Congress approves the rules for the canvassing of the Certificates of Canvass for the presidential and vice-presidential positions.
May 26 – The National Board of Canvassers through the Joint Canvassing Committee composed of evenly of both the Senate and the House of Representatives convene.
May 28 – Canvassing finally starts with the first certificate of canvass (COC) from Laos to be opened.
May 31 - June 4 - The issue of null votes i.e. overvotes, undervotes, abstentions, were raised by the Aquino-Roxas Bantay Balota (Aquino and Roxas Ballot Watch). COMELEC, however, stated that the rule on null votes is equivalent on the rule on stray votes before automation, thus the rules on stray or null votes would apply even if votes were manually counted in an electoral protest.
June 4 - Several municipalities which declared failure of Elections on May 10 hold rescheduled elections. These were mostly in Lanao del Sur.
June 8 – Canvassing ends with Aquino (15,208,678) and Binay (14,645,574) winning the presidential and vice presidential elections.
June 9 – In a speedy deliberation in a public session, the Congress approves the report of the Joint Committee officially proclaiming Aquino and Binay the winners. Through a speech read by his son Senator Jinggoy Estrada, Estrada concedes and promises to support Aquino.
June 30 - Aquino and Binay inaugurated as president and vice president of the Philippines.
July 10 – Roxas files an electoral protest against Binay at the Presidential Electoral Tribunal (PET). Binay's camp shrugged off the protest and says that tribunal will "uphold his victory".
July 12 – The Presidential Electoral Tribunal (PET) declares the electoral protest of Roxas "sufficient in form and substance". The PET issues summons to Binay to respond to the protest within ten days.
SWS conducted an exit poll. SWS's 2004 exit poll missed by a large margin the result.
According to the SWS exit poll, 45% of Muslims voted for Binay, while only 17% chose Roxas and 28% for Legarda. About 75% of the members of the Iglesia ni Cristo voted for Roxas. Despite having the endorsement of several Catholic bishops, de los Reyes only got 0.2% of the Catholic vote, while Aquino, despite being branded by some Catholic organizations as not pro-life, got 44%.
When there are two or more candidates who have an equal and highest amount of votes, Congress, voting separately via majority vote, will choose among the candidates who have an equal and highest amount of votes to be the president.
The Supreme Court shall "be the sole judge of all contests relating to the election, returns, and qualifications of the President or Vice President".
There are several parallel tallies, with the Congressional canvass the official tally. The COMELEC used the election returns from the polling precincts; the Congress as the national board of canvassers will base their official tally from the certificates of canvass from the provinces and cities, which were derived from the election returns. The accredited citizen's arm, the Parish Pastoral Council for Responsible Voting (PPCRV) also used the election returns from the polling precincts. In theory, all tallies must be identitcal.
Presidential election results per province and city.
Vice presidential Election results per province and city. Loren Legarda and Bayani Fernando, despite having more votes than Edu Manzano, failed to win in any province or city where COCs had been canvassed by Congress.
On June 8, Congress finished canvassing all of the votes, with the final canvass showing that Aquino and Binay had won. Aquino and Binay were proclaimed as president-elect and vice president-elect in a joint session on June 9. The president-elect and vice president-elect were inaugurated on June 30, 2010.
Results of provincial canvasses for the presidential election
Results of provincial canvasses for the vice presidential election
Swing as compared from the 2004 election: In 2004 the Liberals didn't field a candidate and instead supported Lakas-CMD's candidate Gloria Macapagal Arroyo as part of the K-4 coalition. 76% of the provinces and cities that Arroyo won went for Aquino. PMP's nominee in 2004, Poe, was the nominee of the KNP and retained 20 provinces and cities, and picked up 6 more provinces and cities, all but one in Mindanao.
Margin of victory is less than 5% for the presidential election:
The COMELEC originally released results for president and vice president based from election returns but stopped in order not to preempt Congress. The COMELEC held their tally at the Philippine International Convention Center at Pasay.
According to the Fair Elections Act, the COMELEC's cap on spending is 10 pesos per voter for each candidate and another 5 pesos per voter for one's political party; since there are about 50 million voters, a candidate can spend up to 500 million pesos and a party can spend an additional 250 million pesos.
The following is a list of published campaign expenses; the COMELEC has no ability to confirm if these were true.