Salariul meu nu este mare, așa că economisesc mai mult.

In Romanian, possessive adjectives like meu usually come after the noun:

• salariul meu = my salary
• casa mea = my house
• prietenii mei = my friends

Also, salariul includes the definite article at the end:

• salariu = a salary
• salariul = the salary

So salariul meu literally means the salary of mine, which is the normal Romanian way to say my salary.

Romanian often puts the definite article at the end of the noun instead of using a separate word like the.

So:

• salariu = salary / a salary
• salariul = the salary

In this sentence, salariul meu means my salary, and Romanian normally uses the definite form in this kind of possessive structure.

Because salariu is a masculine/neuter singular noun, the possessive form must agree with it.

For my, Romanian uses different forms:

• meu = masculine/neuter singular
• mea = feminine singular
• mei = masculine plural
• mele = feminine/neuter plural

So:

• salariul meu = my salary
• cartea mea = my book

Even though many neuter nouns behave differently in the plural, in the singular they usually pattern like masculine nouns, so meu is correct here.

Yes. Nu este and nu e both mean is not.

• nu este = more formal, full form
• nu e = more common in everyday speech

So these are both natural:

• Salariul meu nu este mare.
• Salariul meu nu e mare.

The meaning is the same. The version with este just sounds a little more careful or formal.

Romanian often drops the subject pronoun when it is clear from the verb ending.

• economisesc already means I save / I am saving
• the ending -esc shows 1st person singular

So:

• economisesc = I save
• eu economisesc = I save, with extra emphasis on I

Usually, Romanian does not need eu unless you want contrast or emphasis.

Așa că means so, therefore, or that’s why. It introduces a consequence.

In this sentence:

• Salariul meu nu este mare, așa că economisesc mai mult.
• My salary isn’t big, so I save more.

It connects the first idea to the result. Other common Romanian connectors with similar functions include:

• deci = so / therefore
• prin urmare = therefore / consequently (more formal)

But așa că is very common and natural in everyday Romanian.

Literally, mare means big / large, but in Romanian it is very common to use it for things like salary, price, amount, or importance.

So:

• un salariu mare = a high salary / a big salary
• un preț mare = a high price
• o sumă mare = a large amount

Even though English often prefers high for salary, Romanian normally uses mare.

Mai mult means more.

In this sentence:

• economisesc mai mult = I save more

It is the comparative form of mult:

• mult = much / a lot
• mai mult = more

Depending on context, mai mult can refer to:

• a greater amount
• greater frequency
• a higher degree

Here it most naturally means I save a larger amount or I try to save more money.

Economisesc is the 1st person singular present form of the verb a economisi (to save, in the financial sense).

Present tense:

• eu economisesc = I save
• tu economisești = you save
• el/ea economisește = he/she saves
• noi economisim = we save
• voi economisiți = you all save
• ei/ele economisesc = they save

This verb belongs to a common pattern where the eu and ei/ele forms end in -esc.

Usually a economisi means to save money or to economize.

Examples:

• Economisesc pentru o vacanță. = I’m saving for a vacation.
• Trebuie să economisim bani. = We need to save money.

If you mean save time or save energy, Romanian often uses a economisi too:

• economisesc timp = I save time
• economisesc energie = I save energy

But if you mean save someone in the sense of rescue, that is a different verb:

• a salva = to save / rescue

The comma separates two clauses:

• Salariul meu nu este mare
• așa că economisesc mai mult

Since așa că introduces a result or consequence, Romanian normally places a comma before it in this kind of sentence.

So the punctuation helps show the structure: statement + result

The original sentence is already correct and natural. In casual speech, many speakers would shorten nu este to nu e:

• Salariul meu nu e mare, așa că economisesc mai mult.

You might also hear banii added for clarity:

• Salariul meu nu e mare, așa că economisesc mai mult bani.

However, that last version is not standard because after a economisi, Romanian normally does not use mai mult bani. A better standard phrasing would be:

• Salariul meu nu e mare, așa că încerc să economisesc mai mult.
• Salariul meu nu e mare, așa că pun mai mulți bani deoparte.

So the original sentence is a good, correct standard version.