Jag anmäler mig idag.

Anmäler is the present tense form of the verb anmäla.

• anmäla = the infinitive, to register / to report / to sign up
• anmäler = register / am registering / sign up / am signing up, depending on context

In Swedish, the present tense is often formed by adding -r to the infinitive:

• anmäla → anmäler
• tala → talar
• studera → studerar

So Jag anmäler mig idag uses the correct present-tense verb form for I ... today.

Mig is the object form of jag, and here it is used reflexively.

That means the subject and the object are the same person:

• Jag anmäler mig = I register myself / I sign myself up

Many Swedish verbs are used with a reflexive pronoun, where English often does not use one.

Compare:

• Jag tvättar mig = I wash myself
• Jag anmäler mig = I sign up / register

So mig is necessary here because anmäla sig is a common reflexive expression.

Because in this meaning, Swedish normally uses the reflexive form anmäla sig.

There is a difference between:

• anmäla något / någon = to report or register something/someone
• anmäla sig = to register oneself / sign oneself up

So:

• Jag anmäler mig idag = I’m signing up today
• Jag anmäler kursen idag would sound odd in most contexts unless you mean something like reporting/registering the course itself
• Jag anmäler honom = I report him

So mig is not optional if the idea is I sign up.

In modern Swedish, idag is usually written as one word.

• idag = today

You may also see i dag, and that is also accepted in many contexts, but idag is very common and standard in everyday writing.

So for learners, idag as one word is a safe choice.

Swedish word order is fairly fixed.

In a normal main clause, the usual pattern is:

subject + verb + sentence adverbials/objects/etc.

So here:

• Jag = subject
• anmäler = verb
• mig = object/reflexive pronoun
• idag = time expression

That gives:

• Jag anmäler mig idag

Jag mig anmäler idag is not correct Swedish word order.

Yes. Swedish present tense often covers both simple present and near-future meaning, especially when there is a time expression like idag.

So this sentence can mean something like:

• I’m signing up today
• I sign up today
• I will sign up today

The time word idag helps show when the action happens, so Swedish does not always need a separate future form.

You usually know from the structure and the context.

Common patterns:

• anmäla något / någon = report something/someone
• anmäla sig = sign up / register oneself

Examples:

• Jag anmäler en skada. = I report a damage/claim.
• Hon anmäler honom till polisen. = She reports him to the police.
• Jag anmäler mig till kursen. = I sign up for the course.

So in Jag anmäler mig idag, the reflexive mig strongly suggests the sign up/register meaning.

Sometimes yes, but not always.

If you say what you are signing up for, Swedish often uses till:

• Jag anmäler mig till kursen. = I’m signing up for the course.
• Hon anmälde sig till tävlingen. = She signed up for the competition.

But if the thing is already understood, Swedish can stop at:

• Jag anmäler mig idag.

So the sentence is complete even without saying what you are signing up for.

No, not like English mig.

Mig is commonly pronounced roughly like mej in everyday Swedish.

So even though it is spelled mig, the pronunciation is often close to:

• mej

This is very common in spoken Swedish.

Usually, in standard writing, you should write mig.

• mig = standard written form
• mej = common informal spelling that reflects pronunciation

So for learners, it is best to write:

• Jag anmäler mig idag.

not

• Jag anmäler mej idag.

unless the style is deliberately informal.

Both are useful, but for this sentence you should especially learn anmäla sig as a set expression.

Why? Because the meaning changes depending on whether the verb is reflexive:

• anmäla = report / register
• anmäla sig = sign up / register oneself

So if you want to use the sentence pattern correctly, memorize it as:

• att anmäla sig

That will help you avoid leaving out mig/dig/sig/oss/er when needed.