Four abbreviations decide the shape of your entire application year, and most students pick between them based on which deadline feels less frightening.

The difference that matters is not the date. It is what happens if you get in. One of these plans commits you to attending a university before you have seen a single number from its financial aid office. For an international student who needs funding, that is the single most consequential choice on the Common App.

Here is each one, what it binds you to, and how common it actually is across the 1,072 universities with deadline data in the Borderless database.

Early Decision

Binding. You apply to one university, and if it admits you, you go.

UChicago puts it as plainly as anyone: "Early Decision I and Early Decision II are binding application programs, meaning that you commit to enrolling at UChicago and withdrawing all other applications upon admission to UChicago."

You sign an Early Decision Agreement countersigned by your counsellor and a parent. Duke's version states the commitment in full: if accepted, "you must immediately withdraw any applications you have submitted to other colleges and universities and make no additional applications to any other university in any country."

That last phrase matters if you are applying in more than one system. An Early Decision acceptance ends your UCAS choices and your applications at home, not only your American ones.

What this costs an international student. You are agreeing to attend before you know what it will cost you. If the aid offer is thin, you are negotiating from inside a commitment rather than choosing between offers.

One protection is written into the agreement itself. Duke's wording, which is standard: "If you are an Early Decision candidate and are seeking financial aid, you do not need to withdraw other applications until you have received notification about financial aid." So the sequence is admission, then the aid letter, then withdrawal. Never withdraw before you have seen the number.

Release from the commitment is a separate matter, and narrower than students assume. Policies are set by each university and some are strict. Northwestern's states that students "may be released from this binding commitment only in cases of documented financial hardship." Read the release wording of any university you are considering binding yourself to, before you sign.

Early Decision II is the same commitment on a later deadline, usually in January, with an answer in February. It exists for students who were rejected or deferred from an early round and now have one university they are sure about.

How common: 233 universities offer Early Decision, 127 offer ED II.

Early Action

Non-binding. You apply early, you hear early, and you owe nobody anything.

If you are admitted under Early Action you keep every other application alive. The Common App states it plainly: if accepted Early Action you do not need to withdraw anything "unless you have already decided to attend," because Early Action is non-binding and you can wait to hear from your Regular Decision universities.

You reply by May 1 like everyone else, after you have every offer and every aid package on the table.

For an international student who needs funding, this is usually the right early option. You get the psychological benefit of an answer in December and give up nothing.

How common: 442 universities, making it the most widely offered early plan. A further 82 run an Early Action II round.

Restrictive Early Action

Non-binding, but exclusive. You may apply early to only this university, with named exceptions. Harvard, Yale, Princeton and Stanford are the well-known users, and it is also called Single-Choice Early Action.

Harvard's rule is that you may not "apply to any other private institution under an Early Decision, Early Action, or Restrictive Early Action plan, or to a binding early program at a public university." If admitted, "you are not obligated to attend, and have until May 1 to reply."

The exceptions are the part worth memorising, because they are wider than students assume. Under Yale's version you may still apply early to:

• a non-binding rolling admission programme
• a non-binding early programme at a public institution
• an early programme that notifies applicants after January 1
• any institution outside the United States

Harvard's list adds military academies, and permits early applications for scholarships or academic programmes elsewhere where the timing is genuinely necessary and the outcome is non-binding.

Read that fourth exception again if you are applying internationally. A Yale or Harvard restrictive early application does not stop you applying to Oxford, to a university in Canada, or to a public university at home. Students turn down early rounds abroad every year believing it does.

One more useful detail: if you are deferred from Harvard's early round, you may then apply Early Decision II somewhere else.

How common: only a handful of universities use it, but they are among the most applied-to in the world.

Regular Decision

Non-binding, and the default. You apply by the main deadline, usually 1 January, hear in March, and reply by 1 May with every offer visible.

Nothing is given up. You are comparing offers and aid packages side by side, which is exactly the position Early Decision removes you from.

How common: 497 universities in the data.

The one nobody mentions: Rolling Admission

Here is the finding that surprised us in our own data. Students talk about the year as though it has two deadlines, November and January. It does not.

Rolling admission is the largest category. Applications are read as they arrive and decisions come out continuously until places fill, which is why the deadline months in the data look nothing like the story students are told: 692 deadlines fall in November and 723 in January, but 582 fall in July.

Two consequences, both good news.

If you miss January, you have not missed the year. Hundreds of universities are still reading applications in spring and summer.

Earlier is better within rolling. Places and aid are finite, and they are allocated as decisions are made. A rolling application in October is competing for a fuller pot than the same application in June.

So which one should you choose?

If you need financial aid to attend, do not apply Early Decision. That is the whole rule, and everything else is detail. The binding commitment and the need to compare aid offers are in direct conflict.

If you need aid and want an early answer, use Early Action or Restrictive Early Action. Both are non-binding, both give you December news, both leave you free until May 1.

If one university is genuinely your first choice and your family can pay without comparing packages, Early Decision is a legitimate advantage and you should use it.

And put two or three rolling admission universities on your list regardless. They cost you nothing, they answer fast, and they mean you are never in the position of having a single January date decide your whole year.

Start your own journey

Go through your list and write the plan next to each university, then check three things for any Early Decision entry: the aid deadline, whether aid notification arrives before you must withdraw, and what the release policy says in writing.

Then check the restrictive rules before you rule anything out. The exception for universities outside the United States is the one students most often miss, and it is usually the difference between one early application and three.

Kai, the Borderless AI college counselor, tracks which plan each university on your list uses, flags the binding ones, and keeps every deadline in one place so nothing decides itself by default. It's free to use.

Start with Kai, and read the stories from students who did it.