Do I Commit Sin If I Work On Sundays And Can't Attend Mass?

[Studiumecclesiae]

I might get a job where I'll be asked to work on Sundays, bank holidays and so on (which necessarily means big feast days)
I was wondering if I committed si by not being able to attend Mass? If there were no possiblitiy to get an early mass or one on Saturday due to work or whatever, what could I do?
If I went another day of the week, the one I'd have a day off, couldn't it compensate as long as I keep following what's on the missal. etc?

I really need a job to live and this is one of the only opportunities I've got.

[i]StudiumEcclesiae[/i]

[cappie]

From The Code of Canon Law:
Canon 1247
On Sundays and other holy days of obligation the faithful are bound to participate in the Mass; they are also to abstain from those labors and business concerns which impede the worship to be rendered to God, the joy which is proper to the Lord's Day, or the proper relaxation of mind and body.

Canon 1248
1. The precept of participating in the Mass is satisfied by assistance at a Mass which is celebrated anywhere in a Catholic rite either on the holy day or on the evening of the preceding day.
2. If because of lack of a sacred minister or for other grave cause participation in the celebration of the Eucharist is impossible, it is specially recommended that the faithful take part in the liturgy of the word if it is celebrated in the parish church or in another sacred place according to the prescriptions of the diocesan bishop, or engage in prayer for an appropriate amount of time personally or in a family or, as occasion offers, in groups of families.

Since a "grave cause" is needed to excuse one from this obligation it would be a serious or mortal sin to willfully skip Mass on Sunday or a Holy Day of Obligation, as the Church has always taught. Reasons such as the necessity to work to support one's family, child care, personal sickness or the care of the sick, necessary travel etc. would excuse a person on a particular occasions. Those who have continuing reason to be excused should consult their pastor.

From Moral Theology by Fr Heribert Jone translated by Fr Urban Adelman OFM Cap Tan Books:

"Excuses from assisting at Mass. Any moderately grave reason suffices to excuse on from assistance at Holy Mass, such as considerable hardship or corporal or spiritual harm either to oneself or another. Therefore, the following are excused: the sick, convalescents, those that have a long way to church, people hindered by duties of their state or employment..." there are many other examples in the book but these may help clarify.

Edited January 22, 2011 by cappie

[Thy Geekdom Come]

Fr. Cappie lives in Australia and may be unaware, but if you live in the United States (I'm assuming you live in the US), federal law protects your right to attend required religious services without prejudice. Your employer/school must excuse your absence. However, this also places on you an obligation to notify your employer/school of the situation. It would be unjust to skip work for Mass and leave the employer holding the bag with no explanation.